By default settings in the Edtior, Combo Colours should not be a worry.
I wanna suggest a topic about
the usages of sliders and spinners.
> Tick Rate of slider would be 3 in the snappings of 1/3 and so on. Meanwhile, the spinner 'tick rate' is set as 1, in which every 1/4 beat will create a hit in the spinner.
Here's the contradiction, if a spinner is put exactly in 1/3 snappings, the spinner may be incomplete due to unfinished '1/4 snaps'.
For example
https://osu.ppy.sh/s/557316 :
> I want to put a spinner in a 2/3 snap, expectedly it should display 4 hits under 1/3 snapping scale.
> However, under the default settings of 'tick rate' of spinner, 2/3 (<3/4) is counted as 2/4, hence displaying only 2 hits.
In general cases, we solve this issue by extending the spinner in purpose to 1/1 for fulfilling the 4-hits feeling. This could be a potential guideline about the usages of sliders and spinners.
Another topic wanna be discussed is the
positioning of BG photo.
As of my modding experience, I have seen some mappers, especially rookies, are unfamiliar with the adjustment of BG position for a better visual effect, by editing in the .osu in notepad. Relevant concept and knowledge should be told inside the guidelines as well.
SV leniency is another impt topic. In high BPM (I would define it as BPM>200, or it needs another defination), the base SV of Kantan and Futsuu should be able to be exceptionals of current guidelines. A clearer statement about the leniencies of SVs in lower difficulties should be stated as:
Under high bpm difficulties, the base SV of Kantan and Futsuu could be lowered, for the sake of the readabilities of respective level players.
More precised values should also be advised, like Kantan = 1.00x Futsuu 1.20x under BPM=260 etc..