Dorks are not picking up weapons, even thou I got some, any ideas why?
Have you set them to use weapons? Only soldiers will use weapons normally, though dwarves with the Hunting labor enabled will as well, and woodcutters will carry battle axes. To set a dwarf's weapon preferences, use v, scroll to the dwarf, then use the (p)references menu and the (s)oldiering and hunting submenu. Or, use the (m)ilitary screen and the (w)eapons submenu.
The weapons might also be inaccessible, forbidden, marked for dumping, or marked for melting. Oh, and if you neglected to actually make your dwarves military, remember to activate them through the preferences menu or military screen.
So, i'm playing with the Relentless Assault mod, and i've been having some serious problems with my cats all running out of my fort to go do whatever it is cats do. I've got about seven doors between the main exit they use and the main part of my base that isn't barracks / traps / defenses. Is there any way to stop them besides making all the doors un-pet-passable and then checking it to make sure they don't run out when I do battle?
Destroy them all!
There really isn't a good way to do what you want. Making the doors pet-impassible should help, but it isn't 100% reliable since they can slip through when a dwarf does. I've heard that if you chain cats such that every tile in your fort is cat-accessible can clear out vermin without making them wander all over, but that requires stupidly large numbers of cats and ropes, so probably isn't a good idea.
The only other option I can think of is the one I suggested first: killing every cat in your fort. Hey, at least they won't run out of the fort to hunt vermin if they're meat