What the best? Good RMS or more points?
If I add some (manual or not) control point and they increase the RMS, I must delete it even if I know they are correct?
let me guess what you mean:
Do you mean there is a relation between the number of CPs and RMS? Well yes and no i believe . .
What i found - for myself - is, that you better go for as low RMS as possible - no matter of the numbers of CPs.
I always only stop editing when my RMS is around 1. That´s why usually shoot hires panos - and when you zoom in @100% you eveb see very small stitch-errors.
Shooting with a fisheye - low number of shots - it´s a bit easier . . . but also here i go for a RMS of max. 1 - i don´t care for the numbers of CPs.