Use a profile named Ratbomb to make rats walking grenades. They explode when shot. (Unverified)

(Unverified). Use a profile name panzer for explosive bullets. Use a profile name stealth for all-silent bullets.

(Unverified). To get more saves, do one save where you're well off. Restart the mission and kill yourself. When you get the continue menu, load the last save (your previous save) and the save limit should be back to seven.