I don't know yet, but you can do this: go to assets1.pk3/ext_data/weapons.dat and edit it=> near the bottom of the page you'll find this line:
Change AMMOMAX to 999 (this is the maximum valuea, any higher won't wrok). Save it.
Now go to your C:\Program Files\LucasArts\Star Wars Jedi Knight Jedi Academy\GameData\Base and open jaconfig.cgf in your notepad or other tex editor. Find the line:
bind F "+useforce"
and change it so that it looks like
bind F "+useforce; devmap; give ammo_force"