The second is easy: if you have all of the expansion packs and 1.4, in quick mission all weapons will be availible.
If you want them in campaign, go to each of the specialist folders (in the weapons folder), and copy the contents to the normal troops'. I think that there are some you can't get this way, in that case they will be in the equip folder (I think.). You should get some wep mods though, they are a lot better.
The second one, there was a mod around called Mike's Desert Boonies (summat like that anyway). I don't know if you can get it now, the download system has been updated and