I can only answer question 4, many TV's only output stereo over their toslink output so only using a external source for movies will probably solve this.

861v4/ID40, G98, UHD722, Mark and Levinson No. 29, 2 * Linn LK85, Linn LP12, Musical Fidelity X-LPS v3, Empire Vandenhul MC1000, NVidia shield, PS4, Thiel CS2.4, Thiel 1.6 rear, Audio physic Celcius centre, Rel Quake Sub