As the list grows, I think there must a distinction be made between stuff which is already possible by scripting and things which aren't possible with scripting.
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Another suggested not possible with scripting and which would be highly used if available: The ability to add your own submenu's in the right click context menu in the contactlist (in the "msgplus extras" menu) both for contacts as for groups. And the click events would obviously also return the groupname or contactemail.
(for the groups, you can't do much with the groupname yet, but I think it should be returned nevertheless or to be taken in account for later use
)