From NoEffex:

The main thing is the old kernel support, which supports 3.80-(dunno how far it goes, but it works fine on 3.52, with the exception of 3.71, due to it's oddball nature).

Main changes:
* Fixed a lag out issue happening in ad-hoc
* Removed the hijack room and replaced the menu slot with no-fog
* Now, if you use the old kernel version, you can use it on 3.80- (with the exception of 3.71), I don’t know how far down it goes, but it goes down probably to 3.40. I did test it on 3.52 with success.
* Auto-Finds the off value in the custom menu
* Replaced the target lock code on the base UI to “Shoot Exposives To Nowhere”
* Made using the hotkeys a bit more clear to the user