I assume you mean this ammo box that is used by the Opposition to spam the Coalition spawns:
You can make it inoperable by remming out the lines for it in the StaticObjects.con file. Look for this line:
Object.create ammobox
Object.absolutePosition 1002.78/78.24/1106.74
Object.rotation 0.00/0.00/0.00
And change it to:
rem Object.create ammobox
rem Object.absolutePosition 1002.78/78.24/1106.74
rem Object.rotation 0.00/0.00/0.00
It will still be there and the ammo icon will still show up, but it will not rearm anyone. As for adding a spawn, I've always found it easier to just move them.
Also, while you are in there, don't forget to rem out (or move) the insta-death spawn on the Opposition side. It is new_soldier_spawn11. Just find it in the SoldierSpawns.con and either move it so that the player doesn't spawn in the wall, or just rem it out like this:
rem *** new_soldier_spawn11 ***
rem Object.create new_soldier_spawn11
rem Object.absolutePosition 1246.53/72/927.86
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