"Drag n Drop Acid Loops in RB Will Auto Stretch to Key/Tempo"
This would make things quicker than opening the Loops window and searching.
Drop Loops.MP4
Drop Loops.WMV

until there is a decent loop browser in RB you can just use FreeCommander , with it you can find and preview Loops instantly wav,mp3,mid etc.. To get instant preview go to Tools > Settings > View > Viewer > untick last 3 boxes > Quick view > Multimedia auto start playback