The purpose of this topic should be clear, so here are my suggestions:

Some leaderboards have both a RTA and an IGT column and it would make a lot of sense to add that to all staff ghosts and maybe all cups.
Speaking of all staff ghosts, I agree with superSANIC that loading the staffs is pretty much only a waste of time and noone likes to do that, so we might want to change it to "all tracks time attack".

The only problem is that all current runs on the leaderboard are optimized for all staffs making it a bad RTA time for all tracks TA, so if we use IGT then there is almost no difference anymore. The only disadvantage is that you somehow need to weight in deaths and resets.
The only solution I have in mind for that is to add the time on the last frame visible when before you die/ reset.

Btw. we can put all cups + all cups master to one category and just add on what difficulty you did the run on ( novice, standard, expert, master and custom ).

I'm down with both of these changes. Somehow I never thought of adding a 5th option to the difficulty to fix the problem of different ones being used. Though I'd suggest calling it "Mix" rather than "Custom"

If we do implement these changes I do ask of you all to calculate the IGT for your own All Tracks Time Attack run, because it does take some time. Also, not like it's a big issue, but if you die from falling off course and the video is 30 FPS, it might be off by 1/60 per death. I personally don't really care but it's worth pointing out

oh yeah, that's a small problem. I guess you don't have another choice than adding one additional frame to it every time, so 0.017 secs to it, but it shouldn't affect the total time by any big margins. I think everyone can live with that.

tldr: Ban emulator, add CGN's times, update leaderboards to use sub categories, drop-down filters or whatever. Also add in new boards for All TA tracks & misc stuff like no boost, 26 machines etc. Individual cups might be neat as well.

IGT would be nice, but real time should still be default, especially if All tracks & All staffs are separate.