I think you can just as easily short stroke a controlled round feed
Short stroking is a function of stress, not mechanics
short stroking happens when someone used to shorter actions fails to pull the bolt fully to the rear, and fails to pick up a round from the mag on reclosing the bolt.
this an action length thing, and can happen with push feed or controlled feed.
where controlled feed helps is when a round has been stripped from the mag and chambered, but the bolt has not been turned down.
should one pull the bolt back then for whatever reason, the control feed will extract and eject the round, while the push feed will leave it in the chamber.
both actions will now strip a round from the mag and try to chamber them on forward stroke of the bolt.
the crf will be successful and the p.f. will jam the new round against the chambered round.
herein is what controlled round feed is really all about.
while it defies logic, and is highly unlikely, even really experienced shooters can have the above thing happen.
bruce.