SamyGO

mmh no, 0 is disabled, you expect too much service menu to be tweak menu. If you need "instant" off, you usually use CEC (if it wants to work correctly )

Well TV is just remembering you on which source you are, in case you forgot
Nothing can be done out-of-the-box imho, and there's unfortunately no root available for your model...

Not especially :) Not sure it would be 100% reliable (e.g: PVR and other "not using power button" cases), but you could also setup some dummy (even unexisting) CMD_ON/CMD_OFF then check in log which one was "launched" as latest: [SoftPowerOff] Launching CMD_OFF: ... [...] [SoftPowerOff] Launching CM...

In that lib, not as far as I remember... Otherwise I'm sure libChanList reports it (you can use NOLIST arg to not parse channels uselessly everytime): [ChanList] SamyGO D/E/F/H libChanList v0.2.2 - (c) zoelechat 2015 [ChanList] lib_init, >>> [ChanList] TV mode: 0 Air (Soft-Off) [ChanList] Current ch...

Well no idea what's that "banner across the top of the screen with the input and time", except if it's simply expected current source info... Any screenshot?

Sure, you can also do manual copy of recordings to NAS

You make too quick assumptions, you don't know what's inside

"we" don't know? YOU don't know

Maybe you should check root availability there
Warning : Firmware upgrade and root E/F/H/J/K/M/Q

Non-Tizen T-NT14MJ? No.

I don't remember it has been done/possible even on H... Also Tizen TVs have almost nothing comparable to "other series".
Without me anyway