For mania i think there arent too much helpfull things. Notes is probably the most important. They have a great effect when playing or the stagelight. You can have that big or invisible or just hardly noticeable, it all makes a difference what a player prefers. Column width is also a good thing to edit in the skin if a player has less less trouble with reading wide or super wide skin. The lighting effect can also make some difference when you notice it when playing but i think it is minimal because you have to pay attention for other things. I dont think there is any sort of in skins for mania that makes you alot better, only user preference.
Edit: For CTB note im not a really CTB player but i can imagine a round fruit skin that looks the same for anything, like just a blue ball or something could make a difference. Also making the numbers transparent maybe? Since i read some people complaining they are blocking in fl mode but i dont know. Just an idea
Edit: For CTB note im not a really CTB player but i can imagine a round fruit skin that looks the same for anything, like just a blue ball or something could make a difference. Also making the numbers transparent maybe? Since i read some people complaining they are blocking in fl mode but i dont know. Just an idea