Main weapon slot could be used for carrying an extra bag or another bulky item (like engine parts or main rotor assembly). Of course, meaning you won't be carrying a weapon at the same time. And what if existing slots were 'overloaded' slots? I.e. if you fill those, you're automatically overloaded. When overloaded, you can run, but, say, you then have a 1% chance of tripping and falling (could be scripted with forcing user to go prone for a second), checked every second or so, same as with low-blood conscience loss?