Nope, you can't have it set to a custom resolution, and I don't see why you would want to. Can't you just resize the window to whatever size you want? Why do you need a specific resolution, and why doesn't a maximized window work for you?
hmm i can not resize it to exactly 1920x1080 it is always just close to it but not exactly
The Problem is that i have got a Monitor that is 1920x1200 this size is bad for recording.
If i had a monitor with 1920x1080 it would be no problem.. but i got none of that size XD and i dont like to set my monitor resolution to 1920x1080 to get a good recording because then everything is stretched (just for me, not at the video then)