Hello!

Sometimes when I sign to raids/keys people are requesting a note with exp. But I usually have "Skip Sign Up Dialog" unchecked.

It would be very nice if I could add an expression to add a note to my signup, without having to go into addon options and set my note in the pop up box every time.

You can just hold shift while clicking on a group to get the sign up dialog where you can enter the message. By default, the message is persisted, but you can switch this off in the settings of PGF.