Im really new to this game and i was wondering how to edit weapon stats like the number of rounds they can hold and their power and other stuff like that. Thanks for the help.
Quick and easy way.
look in the doom3/base directory. Use WinRAR to open the pak000.pk4. look in the def directory. Find the weapon_???.def files. They contain lots of the info you want. Also mp.def contains updates to the weapons for multiplayer. If you want to edit them, make a new directory. Unzip the files you want to that directory. Make your changes and zip them into a new pk4 file. You may need to keep the directory structure of the pk4 file the same. So in the pk4 file, you would need a dir called def, then put the .def files in there. Then load quake. Click on MODS and select the directory name you made. If you did everything right, your playing your mod.
you could also (probably easier) over mp.def, in the top you'll see -most- weapons extending eachother. If it's yust stuff like fire rate, damage, clip-size etc. you want to edit you can do it there by re-setting the variables for those