GTX-330 Question

I'm thinking of getting a GNS 430 and the GTX 330 put in my plane. I
have a couple of questions that I would really like some answers to:

1. My aero radio people tell me that they think the GTX 330 display
is always up on the map. I.e., I can't declutter or eliminate it if I
want to, say while flying an instrument approach and not really
needing/wanting the mode-s traffic info on the screen. True?

2. I assume that the traffic warning in the mode-s will not alert to
traffic if I'm not in a mode-s area, and/or there are aircraft only
only squaking mode-c or other. In other words, if I'm fling along out
in the hinterlands (a frequent occurance) where there is no mode-s,
the traffic warning is nonexistent!! Wouldn't I do just as well with
a portable Monroy, or similar, traffic alerter?