tcas on departure/final approach

[almost professional]

scenario:-public transport aircraft lined up to depart,VFR helicopter, transponder on, manouvering NW of airfield below 1500ft within two miles-VMC, traffic info passed and helicopter in sight of departure and vice versa.
A:would you refuse to depart on the grounds a TCAS RA would be generated?
B:when airborne would you comply with a TCAS RA generated by the helicopter?

Also is there a lower limit level wise below which TCAS should be inhibited?

thanks in advance (yes this is something that has happened more than once and the only way round so far has been to get the helicopter to squawk standby, hardly a satisfactory procedure)