As a person who enjoys to drive vehicles such as APCs, Tanks, and Logistics trucks. Sometime I am not able to hear my teammates talking and it requires me to jump out of the vehicle to hear the person
But on the other hand when in big maps. it is essential to hear where armor or shoots are coming from in which case i need to rev up my in-game effects.
Solution:
Add an earplug option to the T-rose. This, when selected, will lower in game effects but not VOIP. this will allow you to chat easily in a vehicle, or in loud situation such as a firefight.

Proof of concept:
British troops to wear smart earplugs in Afghan combat • The Register
Ear damage in soldiers: US Soldiers in Iraq, Afghanistan Suffering Hearing Loss
How will this work?:
Use the T-rose, and select it by pressing it on screen, when selected a messgae will appear that will say either "Earplugs are IN" or "Earplugs are OUT". So now you can communicate with 25-50% less in-game sound.

So Now:
Please give me input on the suggestion. I checked the forum so i believe it inst suggested.
It may be in Arma 2 but currently not in BF2 Project reality.
hopefully this is not hard coded.
