@ 2: What is the notion behind giving your squad/platoon an ATGM, but leaving the 60mm mortar with the company?
If you group different effectors at a certain level, they should be akin in range and impact (RPG - MGL; mortar - ATGM).
And what do you do with those low echelon (platoon) 3-men special weapons shooter team if you don't need their special capability? A fourth mini-squad? Add one man to each existing squad (Then you might run into group-dynamic and transportation problems)? Or leave them at home? Group them one level higher and you have another full squad.
Plus I wouldn't be comfortable with having just one ATGM team out there.

@ 3: The M-32 is what I have in mind. I have no idea how useful/popular UGLs are. I just think that a single dedicated weapon with one characteristic is enough, not two tactics/ballistics/effects for one man. Plus the MGL shooter is probabaly better with his weapon than a stand-in grenadier.