I sometimes vote a thread hot but once the thread has grown and more
knowledge is shared about the product/offer I sometimes consider
removing my hot vote. How about leaving the up arrow ghosted, the
middle changed to 'undo' (returning all arrows to active state) and the
down arrow always available (so that it undoes the vote and makes it
cold at the same time)?
Maybe I've missed something and I can already do this (probably!)