Yep, those macro's can e very useful.
I've got my manual gear that way via Saitek and VAC
Apparently you have your fraps screen shot key other than the printscreen button,
Because the Printscreen button will activate IL2 to do it, and it will cause lag for sure.
If your not already, force frps to record it in jpeg, so it's an even smaller file, so it will be quicker, and less resources.
You might be able to set it to 1/4 second, to smooth it out.