A front derailer cage's outside plate has been bent inwards slightly (bike was locked up against a fence post, FD got pushed against it). Does anyone have a good technique to get it back to being straight?

>>2041257
If that's your most frequently used gear it could be a worn sprocket. In any case, remove the cassette and inspect for wear or bent teeth.

>>2041233
Depends on the specific hub if there's a good way to remove/disable the reaction arm for the coaster brake.

>>2041176
Works fine as long as your QR skewer is one that offers adequate clamping force. A skewer with steel nuts and an internal cam is your safest best.