I can't recall where, but I think when the mole happens has been discussed before. There are pros and cons to both ways. With instant moling, you still have the issue that people are ready for you, but instead of waiting for someone to spawn, they just have to scan everyone. Either way both sides have about the same advantage. Either you both need to snap when you spawn for our way, or both are already aiming at heads with instant.

As for the speed race issue, if everyone is out, what you do is flank them. On maps such as office, italy and aztec, you can fairly safely assume you can walk up behind someone who is in a firefight with your team quite quickly. Also, unless they actually notice you moled, the fact that you DON'T kill people in spawn means you can get a mole or two in before people start watching for you.

The disguise, I agree, I'd rather have it all round. I may make more comments here after I look up some stuff later.

The ultimate issue, I have wondered why Warden is the special one who can't respawn when he's alone.