I found the select what you think is essential in a game to make it accessible section confusing.
3D audio is always nice, as AHC has shown us, but isn't always needed, completely depends on the game, in a side scrolling fighting game or beatemup, all you need is stereo with total channel separation for each side, and in a turn based strategy game, their is no need to turn towards a sound, but in a 2d/3d shooter or object heavy adventure game/rpg it's vital.
A sonar is not needed as long as you have a way to see what items are around you using TTS of some kind, good examples of this are Shades of Doom, the BK series, and the new tomb hunter. though it could be a supplement, and I can see it being allot easier to put into a video game than TTS... But in action heavy games/reverb heavy environments it'd be hard to hear anyway... It really depends on the game, if it's telling you about deadly hazards or places you could go, such as doorways, containers, or platforms like in A Hero's Call and BK3, than that'd be invaluable, but something you trigger your self just to get an idea of the space or see how far away the wall is usually has limited usefulness in my experience.
Sonification is something else where TTS would be just as useful and potentially more intuitive, but again it depends on the game. If we're talking an action heavy fighter, than a quick, unique sounding readout for various power meters would be a great use for it, but in a strategy game or RPG? you have so many potential stats and buffs/debuffs that it can't easily be represented I'd imagine. But again, no useful way to get TTS into the actual game has been found yet anyway for console gaming so it's kind of a moot point.
Skipping and repeating cutscenes is important for any player, so not sure why it's included here.
When you say guided installation, I'm confused, aren't most installations for games guided in some way, I mean it's not like setting up a linux server... If you just mean voiced than yes, that would be necessary of course, but otherwise I'm not sure what you mean. I don't think their is any problem messing around with an .ini file or CMD a bit as long as the instructions are good and the process it's self is accessible with standard screen reading software...
Auto aim is only necessary if the game can't be played without it, that would be one of those adding accessibility after the fact kinds of things, but an audio crosshair or something would always be preferred I'd think, no one wants the game dumbed down when it doesn't have to be.
Button remapping has nothing to do with sight, least not anything I can think of...