after a quick look thru the forum another thread that sets off alarm bells!
first thing read the POH, it seems that that is all i post but with good reason, that is where most answers lie!
section 4 (normal procedures ) in the R22 POH, read the daily preflight and lo and behold it states
' removable controls should be removed if the person in the left seat is not a rated HELICOPTER pilot '
i would add a R22 rated pilot and certaintly if you hired a machine from the company i work for the duals would be out and in the office so you couldn't reinstall them!
incidentally have you read safety notice SN-34 ?
in respect to the 'larger' passanger catching on the collective he may , but is he/she over the seat weight limit? in my experience this comes before a control restriction. Again read the manual.
as a flight instructor (not just on the R22) i encourage any pilot to buy the POH of the machine they fly, read it , understand it and subscribe to the amendments service - the manufacturer knows more about the machine that most pilots.
You can lead a horse to water but not make him drink.
the information is always avaliable if you can be bothered to get it, when in doubt ask!