I think nintendont should be allowed as long as there is a buffer. Maybe compare load times and add that time or just make it a different category like SM64 does

Well its up to the mods, not the general public. Message a mod with your proposal or in the discord

There are a couple difficulties that come up with this.

1. The amount of time Nintendon't saves on loads isn't necessarily the same between runners. This came up as an issue in Sunburn speedruns recently where certain players ended up having much faster loads, even though everyone was playing on Nintendon't.
2. Nintendon't affects other things besides load times. In particular, it removes lag in certain areas of the game (try spamspraying in the village in Bianco 7 on Nintendon't, then on Wii, for instance), and it can cause abnormal behaviour in certain shines (Manta insta-death is Nintendon't exclusive).

These differences mean getting an accurate offset to add to the timer for a run on Nintendon't would be all but impossible.

Side-note, the discord has a channel (#lb-discussion) dedicated to this type of talk. Bringing it up there is probably your best bet to gauge community interest since SRC forums are not payed much attention usually.