I am working on a new version of BevyOBars - completely new from the ground up - and was messing with SetStretchMode. The following lines allows re-sizeable quickslot icons!
self.Quickslot[n]:SetStretchMode(1)
No doubt others will get a workable product out faster than I as this new version is going to take a *lot* of work - but hooray! At Last!
And if this is common knowledge I will feel such a fool...
EDIT: Any size setting must come AFTER the SetStretchMode line...
EDIT: Any time a shortcut is changed the quickslot re-sets. To overcome this the ShortCutChanged() event has proved useful.