I never had any problems with CTD's and grenades. I would suggest you check the BMP folder and made sure none of the folders are set to read-only. The CTD's your experiencing could be caused by a writing violation.
About the grenade timer, the M84 only has a 2.3 second fuse, but you can make it longer if that suits your gaming style better. Edit the Grenadeinfo file in the INI\Items folder, the value you wanna change is the number third from the last.
Here's the M84 as an example, it's the number in red that you wanna change:
"M84"
HFlash "Grenade\Explosion\grenade2.wav""Grenade\LoadReady Sound\None"0 0 0 8 15 0 2 1 2.3 0 0
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