Not just mouse but I've seen people having trouble with streaming with a mouse and no keyboard.
I found a map with an insane difficulty on it that isn't too fast and has a subsequent amount of triple beats and stream it's good to practice on and it's helping me improve.
https://osu.ppy.sh/s/119739
Rin - Spring of dreams Insane
I found a map with an insane difficulty on it that isn't too fast and has a subsequent amount of triple beats and stream it's good to practice on and it's helping me improve.
https://osu.ppy.sh/s/119739
Rin - Spring of dreams Insane