Totally agree with you on your reasoning, and your solution (although mine is slightly different.
Here are my thoughts on the matter.
Agile:
Rexo:
However I don't think PS2 will even have holsters, let alone inventories at all. It sounds to me as if it will be a more BFBC2 style system, where you choose your primary and secondary weapons, support tools, etc from a limited selection depending on your armour or class.