BoinxTV Screen Source feature request

Screen Source resizing
I’d love it if you could hold the shift key or something to lock the aspect ratio when resizing a screen source selection.

Screen Source Lock to document or window
Also,it would be great if, like CamTwist can, a screen source could be locked to a document so that as other documents are displayed in the foreground we don’t have to worry if they enter the frame of the screen source.

Thanks for the feature requests!