ofc its realistic, you can throw as many nades in rl as u want (if u have them). but i do think it has an impact on the gameplay. take BC for example, a full server with 32 players each having 2 frag nades (or flash)... there are known choke points on each map and it will be raining nades on these spots^^
same goes for obj/wars, more nades will definately affect the gameplay as tactics change as well. nades have always been a good/popular way to get rid of enemies early and easy (if u know when and where to throw them).
more nades are fun, but arent necessarily better for the game. well thats just my opinion and experience, tho i think coroner tends to go in a similar direction with his idea(only he knows for sure

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Thing that anoys me greatly in many game is that if you throw a granade behind thin wood wall bellow window you dont take any efect on other side so how about small stun and hear impared efect ? Is it possible ?
should be possible yes, but the few bugs we have atm would need to be fixed first imo. nades cant penetrate windows (breaks it and bounces off instead) and the explosion sometimes also kills through (thick) walls (mappers gotta fix this i guess).
we already have some kind of effect on the hearing, tho it can be improved imo.