I concede you better experience in HG combat, but rules, as I understand them, don't seem to say so:
I have no more information than you do: the written rules.
HG80, page 38 (Sequence of Play: Battle Formation Step):
As launching and Recovery is listed after forming their ships in lines, I understand it comes latter...
HG'80 is explicit, if a specific order is intended it is spelled out, like a wargame:
PRE-COMBAT DECISION STEP
There are several decisions players must make before the firing begins. The defender must make all these decisions before the attacker. ...
COMBAT STEP
In the combat step, all ships in both sides' main battle lines may fire their weapons at any other ships in the enemy battle line. To avoid chaos, this procedure has been ordered. To begin, each player organizes the ships in his or her line of battle in order of size with the largest first. Fire is conducted with one ship at a time as target. First, the attacker (the player with the initiative) puts forward his or her largest ship. The defender may fire at it with any of the batteries of any of his or her ships. He may fire as many or as few batteries as he wants, from any combination of ships. He may even decline to fire at all. After all fire against that ship has been resolved (but remember that damage does not take place until the damage step) the defender puts forward his largest ship and the attacker's ships may fire. This continues with players alternating until all ships have been exposed to fire (but not necessarily fired upon) once. If one player has more ships than the other, the rest are exposed to fire at once after the other player's last ship.
There is no order explicitly imposed in the Battle Formation Step:
BATTLE FORMATION STEP
_ Both players form their ships into two lines each. The first is the line of battle; the second is the reserve. Ships in the line of battle may fire and be fired upon. Ships in the reserve are screened; they may not fire and may not be fired upon unless their defending line of battle is broken (see Breakthrough).
_ Launch and Recovery: Ships carrying vessels (small craft or big craft) may launch or recover them. A launch facility may launch one vessel each per turn. A launch tube may launch up to forty vessels in a turn. A ship with a dispersed structure configuration may launch all its vessels in one turn. Recovery of craft is performed at the same rate.
_ Vessels are ready to engage in combat in the same turn that they are launched.
Both players do this concurrently, and I assume (without support other than it has to work) in secret.
There is no explicit limitation on order or into which line you launch craft, so I guess there is no limitation.
In effect, you have to decide first which vessels are launched or recovered before you can decide if they are in the battle-line or not.
Note that:
_ Vessels are ready to engage in combat in the same turn that they are launched.
A sub-craft can engage in combat, i.e. be placed in the battle-line, directly when launched, no mention of in which line mothership is.
So, I would say e.g. a carrier could launch fighters, and be screened by those fighters, in the same round.
I don't think any limitations are supposed to, or should be, placed on this based on vague hints.
Again, sure about this?
While rules don't forbide it, the rules about boarding (page 43) seem to hint it's not possible:
I just follow procedure:
BATTLE FORMATION STEP
_ Both players form their ships into two lines each. The first is the line of battle; the second is the reserve. Ships in the line of battle may fire and be fired upon. Ships in the reserve are screened; they may not fire and may not be fired upon unless their defending line of battle is broken (see Breakthrough).
There are no explicit limitations, so I assume there are none...
If you could move a ship without m-drive to the reserve, I guess this would be done even if so increasing the range, while the rules seem to say that if you increase the range, your ships without M-drive are left behind, even if in reserve
Yes, that is what the rules say. The disabled ship can be in the reserve so it can't be shot at, and still be boarded, even from the reserve.
HG'80, p43:
At any time thereafter, the ship may be boarded. Any ship capable of maneuver may attempt to board, and may do so from the safety of the reserve.
At least the boarding ship must have a functioning M-drive, as explicitly mentioned.
I can only speculate that it wasn't considered a problem that the enemy could board a ship he couldn't shoot at, as it was already disabled.
If so, boarding rules (quoted above) would be IMHO absurd, as those ships would be scuttled, instead of being left to be boarded at any subsequent turn...
The boarding rules ARE absurd. If the ship was ever disabled (and separated), it can forever be boarded, even if repaired and no longer disabled.
I can only speculate that this is adapted from HG'79, without adjustment for battlefield repairs, new in HG'80.
There is no rule about scuttling in HG, perhaps because it is a tactical game, once a ship is out of the game it's irrelevant.