Right now in mania, hitsounding a map is very much optional, however, quite a few BNs still prefer to have fully hitsounded difficulties over just a simple hitnormal.
On top of this, whilst this rule is in place, due to the nature of hitsound diffs being used in mania during the modding process, it's very easy for a BN already to essentially do the hitsounding for a set via a mod to the hitsound diff as a way of circumventing the rule in place.
Given all of this, I feel like if a BN wants full hitsounds for a set, and is willing to add them themselves, they should be allowed to without comprising their ability to nominate the set, and without having to do all this other sneaky work in the first place, given that full hitsounding is optional.
Therefore, I propose the following addendum to the Nomination section of wiki/en/People/The_Team/Beatmap_Nominators/Rules
On top of this, whilst this rule is in place, due to the nature of hitsound diffs being used in mania during the modding process, it's very easy for a BN already to essentially do the hitsounding for a set via a mod to the hitsound diff as a way of circumventing the rule in place.
Given all of this, I feel like if a BN wants full hitsounds for a set, and is willing to add them themselves, they should be allowed to without comprising their ability to nominate the set, and without having to do all this other sneaky work in the first place, given that full hitsounding is optional.
Therefore, I propose the following addendum to the Nomination section of wiki/en/People/The_Team/Beatmap_Nominators/Rules
Do not nominate beatmaps that you contributed to. This includes any major contribution such as mapping, hitsounding, storyboarding, skinning, or slider velocity editing.
For osu!mania Beatmap Nominators, the hitsounding restriction is non-applicable for basic hitsounding (one hitnormal, hitwhistle, hitfinish & hitclap only).