AP = action points, I guess. Games like Fallout use AP's. Same thing really.
One of the things on top of my todo list if they ever release the code is to re-enable all the melee combat commands for the guns. You'd be surprised, but every weapon has melee damage levels (the stat used for the damage strength is also the same used for item quantity (used by ammo clips)).
Actually, the bash command never went away. They just removed the melee attack option, is all. You can actually get this command back by stacking a stun-rod and a weapon together.
Do this, pick up the weapon of your choice. With it on the cursor click on the page button for the floor items. Now, put the gun into your hand slot. It'll vanish. Don't click on the page button again or you'll have to restart. Now pick up the stun rod and put it in the slot you put the gun.
It will look like you're carrying the stun-rod, but it will be using the stats of the gun. However, notice that the 'stun' attack will still be there, and notice how the TU costs have increased to 50% (it's really the melee attack, but its text label still says 'stun'). Depending on the type of object used, the melee attacks can be nigh lethal. The heavy laser's pretty powerful. Test it, it's quite a lot of fun.
It's best used with lasers, so you don't need to worry about checking the ammo, as the stun-rod image won't display the ammo counter. Nevertheless, ammo will be used.
Be absolutely sure that you have enough TUs if you want to move the stacked items about, or else you'll get stuck in an endless loop without any TUs to drop anything.
Note, this stacking thing was really for making space on a crowded floor that's too crowded to fit anything, but not crowded enough to flip to an empty page.
They've completely removed it in TFTD, but it's still in UFO, so make use of it to install bayonets on your heavy plasmas!
P. S: I don't have the melee damage levels on hand, so I cannot recommend any good ones. They all cost 50% of your TUs to use, but some of them do piddling damage, while other can insta-kill a superhuman sectopod in one or two swipes. With the powerful ones, the 50% cost is rather justified, wouldn't you say?
NKF, narrow minded fuddy duddy who refuses to let go of the past and will not accept anything newer than 1979.