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Any time you rotate the OAG (Or the entire scope) you do need to calibrate whatever guide software you are using, but as mentioned above, it should only take a minute or so. If you are messing around looking for the best framing, just take short unguided subs until you like the framing and rotation, then cal the guider and go.
Rigidity wise I have no idea about the standard ZWO guider, the ones designed for the current cameras and filter wheels are very rigid but in other brands I have had good ones (A QHY OAG-M) and really floppy ones that I binned rather than sell on to someone else (An Orion thin OAG) useful for a specific purpose which is using an OAG when backfocus is very tight but not very rigid if you are trying to hang a decent sized camera on the end of it, tilt was different every time it was put together.
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