You can us a number of features in conventional control for PS/3, I refer you to the MTH 44-Ton User's Manual. Start on page #8 for conventional control using a standard transformer. Note that the transformer must have both bell and horn controls to use most of these features.
No battery, PS/3 uses built-in supercaps.
I don't believe you can manually trigger individual crew talk sequences, but you do have access to the PFA mode that goes through a pre-programmed sequence. The PFA operation is described on page 10 of the manual above.