3.6.11 build 5832 supports hull piercing effects in primaries other than beams. The blob itself does not appear from other side of the hull, but explosions occur as usual.
I have applied these effects to ALL FS2 and BP primaries and the end result is quite snazzy. It is quite awesome to see small explosions coming out on the other side of enemy fighter. Large UEF mass drivers really seem powerful when their hits are accompanied by huge burst of flames on the other side of their unfortunate target. These explosions only occur when target is below 10% hull.
Unfortunately these effects do not work on secondaries in build 5832, but Wanderer has already fixed this. Once the next Windows nightly is out, I'll be sure to include secondaries in the happy family of hull piercers.
Also, you may want to replace Exp04 with ExpMissileHit1 in beams-wep.tbm. While it lacks debris, it is overall a better explosion for this effect.