Yea I could technically. I just wish there was a better way to edit the verticies. I did it in the lowest grid possible and still it's not perfectly aligned, at least not to my eye.
But anyway yea I agree with you that flying around in gtkradiant would be nice. I kinda got used to holding ctrl to move vertically, arrow keys to move around, and letters a+z to look up and down in doomedit though.