I prefer a flagged PCC being carried to/from a cart parked at the birm (or stagging area) without RO supervision. Be at the line with your flagged PCC and ready to go when it's your turn. Return to your cart (or staging area) with your flagged PCC after the RIC command. Frankly all this unbagging, uncarting, rebagging etc at the line wastes a whole bunch of time and I don't like it.
A bigger problem right now is that there is no consistency with ROs. Even in the same match ROs are telling the PCC folks different things when they come up to each stage. Example: I want to run my stage as stated above, and the next stage CRO wants them unbagged at the line.