I can move it without even really trying. Then again, if I tighten units to your specifications no one except a body builder (or my lead electrician) can loosen the bolt. Or so I have been told.
Amusing story, I worked for an ME that like you, wanted everything immoble. So I tightened down all his bolts. Well I went on tour the next week and when I saw him after the tour he said I owed him a beer because for his next show they had to strike the entire inventory and use the old screwdriver in a wrench tick (with the extra large C-Wrench) to get enough leverage to loosen the bolt. And apparently, a piece of scenery smashed into a PAR during the run and instead of the PAR giving way, the front end of the unit was caved in and the lamp exploded.
Funny, I agreed with you on 1/4-1/2 turn past finger so its both of our "specs".
I worked with an ME/designer like you that felt that felt it was ok to be able to move lights wiht out having to put a wrench to them. Every show he opened in the time I worked for him had lights out of focus two or three of which made it look like the actors had missed thier spike.
There's stories for and against both methods, and many roads to mecca.