On my mbp, I open xterm under X11 and I want to paste from the clipboard. However, command+v doesnt work and there isnt even an option from the edit menu. Is this not possible? If it is, how do I enable it?
Have you tried the Pasteboard settings in X11? Also, a lot of keyboard shortcuts for X11 actually use ctrl instead of Command (like in GIMP and Inkscape).
Secondly, is there a reason that you're using Xterm instead of Terminal?