Another thing I can think of is that these lighter bombers would be faster than your normal bombers, with ships getting different speeds in 4.86, one could assume that these light bombers would be faster than the normal bombers, but slower than a Light Fighter.
I think these ships would be perfect if we had bomber torps which either did a huge amount of shield and no hull or hull and no shield. If 4 of these attacked a cap (2 with anti hull and 2 with anti shield) all 4 would actively attack the cap. Now although there's only 2 ships that are doing any damage, the cap pilot has 4 to choose from. If all 4 swarmed the cap, it might not pick the right bomber to attack, so while 1 bomber is dodging like mad, it's still getting the same damage.
This would also force the cap pilots to stop and think, instead of just firing as many shots into space as possible, so while an experienced cap pilot would counter this, lolcaps would Q_Q and die. Add in turret splitting and turning while aiming for caps, I'd say that'd be a hell of a battle, and fun for both parties if they win or loose, but that's just me.
Also with that carrier idea of mine, I think these would work becasue in RP terms becasue they're smaller, so you can have more, they'd use less fuel, so you can operate them longer and they're easier to maintain than a normal bomber. Take the new Rheinland Assault Carrier. It hides in Texas, launches 5 of these, they take out the Mississippi and slip back, a day later they take out another cap. For just PvP these ships wouldn't be as good as your normal bomber, but for RP + PvP, I can't see you'd say no to these craft.
And just for reference, ships like the Havok MkII, Falcata and Roc have a recharge of 1722, so it takes 17.27 seconds to charge a SNAC.