TP
<nods>
Inspite of the fact that the manufacturers say to do what you do, I happen to know that a certain company I might work for has the procedure to select TA/RA at the beginning of taxying. Therefore at major bases we do sadly have the prospect of a lot of ssr calling going on in a small area.
I agree with your SA point in principle, but in practice the TCAS display has the potential to degrade SA as well as improve it.
Cheers, CPB