It most likely is. I think the general rule is that all platforms are allowed as long as you don't get an advantage from it. I don't know why you'd want to run on iQue Player considering Emu, Wii VC, and Switch are all cheaper and easier to get.
Yes, I don't think this has ever been clarified but it's an official version of SM64 so it should be allowed for 70 and 120 Star in Multi Mario runs.
Not mainline games, Wario Land is Wario, has nothing to do with a Super Mario game, same goes for Yoshi's Island. NSLU is just NSMBU but slightly different so not it's standalone game, which is why we don't consider it as a mainline game. It is included in NSMB Series cause the NSMB community wanted it so and it sorta makes sense I think.
You can now submit runs to the 602 and 1862 leaderboards under the TA filter if you took breaks for sleep and paused the timer! Rules will be more in depth on the category pages on the leaderboard.
