One little change to mouse modifiers will allow you to quickly loop audio and MIDI items.
First, I recommend turning off all the looping options in Preferences: Project: Media Item Defaults
Then go to Preferences: Editing Behavior: Mouse Modifiers
And assign Media Item Edge : Double Click – Default to SWS: Loop section of selected items
To use quick looping, simply trim an item to the length you want to repeat, double-click the right edge, then drag out the edge to start looping it.
MIDI items might work a bit differently, if you run into trouble try running the glue action first, then it should start repeating properly.
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