Oké, in my opinion that should be sufficient. When the "commit window" is visible along side the "Log graph window" a simple click on this log will reveal the key's status in the "commit window".

Would be great ! And preferably in color. Verify OK = green, NOT OK = red and impossible to verify  = another color ...

Well, I read your proposal about the key sign indicating a tag beeing pgp-signed. So, I voted for this, because I also would like to be able to see if, an by whom a tag was signed. But since commits can also be signed it would be even nicer to get this info too.

Signed commits (with actual info on signature) would be nice !