Eric Stewart with Design Development Architects mentioned this to me the other day and I thought it qualified as a "Reviteristic".
When you use the File menu > Load from Library > Load Family you get to load as many families as you can select in a single folder.
When you use one of the various tools to place a component and then choose to Load a new family you only get to load ONE. Eric wonders why? I wonder why? Seems a bit arbitrary to limit us to just one selection in this mode. Using the component placement tools doesn't seem to warrant the limitation.
I say off with the "shackles"!!