A. if it responds to acceleration the way it responds to gravity
Seems like it should, gravity being an acceleration force after all.
B. if one set up two artificial gravity fields with one perpendicular to the other, would it effectively explode along the "edge" created by those fields
On this I'm going to go with mtu definition of artificial gravity where only the strongest field applies. No Escher floorplans in mtu thank you very much

So, nope, no focused TDX (by gravity*). There are of course regular shaped charges for slicing and dicing and making Juliennefries of MBTs.
* I suppose one might use the usual gravity plane focus of TDX and a conventional focused/shaped effect in concert, come to think on it a second
That goes for in a normal gravity field as well btw, again for mtu. So a ship (or building) with an internal 1G field will have that in effect inside the ship (or building) on a world with a natural gravity of up to 1G. If over 1G then the ship (or building) is subject to the local gravity and may as well not have it's artificial gravity active (or even installed).
If both A and B, it has potential as a weapon. Set up a field perpendicular to the axis of thrust, have the missile do a flyby, the explosion hits like a pickaxe.
It still has excellent weapon potential though, just not quite so fancy. Makes for great Bouncing Betty mines for one. Primarily though I see it as demolition charges and a host of other selected shaped charge applications where you don't need, want, or have the time or luxury of the usual shaped charge forming packaging. As long as the gravity is in concert with the desired effect of course. I seem to recall one of the players in our group years ago (the laser-chainsaw sculptor performance artist I think I've mentioned) engaging in terrain art using TDX

...probably without a permit :devil:
...yes, in CT we had Laser-Chainsaws and Artists as player characters, though none of that was in our LBBs, we made it up

Good times
