then you also have to label the rest 70% "Avoids special goals".
Also, provide the average percentage of runs that will need this label. It sounds too broad and common to warrant a special category (Aims for fastest time was retired for that reason).
In terms of Mupen vs Bizhawk, the question boils down to why are we disallowing Mupen. If it's due to encoders not wanting to touch Mupen, then any time an encoder is willing, an exception can be made. However it's not fair to offer a blanket exception, because it's not known up front whether an encoder will be willing, and that is unfair to players. If this is the issue, then a willing encoder can provide an exception after the specific submission, even if in general we disallow the emulator and want to make that clear.
I don't think any rule should be absolutely 100% rigid, imposed completely blindly in an absolutely totalitarian manner, with absolutely no possibility of special exceptions. Certain rules should be stronger than others, for certain, but there ought to always be at least the possibility of granting an exception, if there are good reasons for it. And exceptions should never create precedents.
Can you please say for this specific game, can "Aims for maximum score" goal fit the vault rules as kind of "full completion"? Or not fit? (Max possible score is finite number.)
Maybe I will keep making them when I finish runs in the future.
Someone more familiar with Discord would have to explain any other benefits it has over IRC.