If you want to do it with a pedal then you need to map the action Toggle Loop for current region. If you just have a DUO pedal you might need to upgrade to one with 4 or 6 buttons.
Regarding the rearrangement: while it would be technically possible to predefine an order of regions to be played, I don't see how that could be integrated into the current UI. You would need to see how a song is layed out for this to make sense. This might be an idea for the UI overhaul in version 4.