Graphics and physics engines, wich offer what i want?

[Ghieri]

I am sorry, but gun Limits are Frustrating, BORING, and also quide you
by the hand, they remove all tactical decision making, and any exitement
from the game goes out the window as well,

I disagree with this point. Having to pick and choose which guns you use requires more thought. Players are more likely to second guess picking up a gun, but it may be worth it.

For reference, Jedi Academy allows you to have all of the guns at one time. It's really thoughtless as to which gun you pick.(it's usually the one with the biggest *boom*) L4d2 and half life 2 force you to carefully consider your weapon options, either through limited gun slots or limited ammo. Makes you think more.

first of all make a gameplay prototype in the engine of your choice.

This.