Why not make it so everybody could use it without asking a moderator, It would be the most logical step if you want more to use it.
I really like if that is the case. If I want to use this feature, I would want to know whether the change is good one or not, asking a moderator to change it every time is rather tedious and I'm sure the mod will be annoyed
You are limited to 200 characters. If you go well over this limit, the beatmap will crash. If you only go a few over, the last few characters of the last line will be truncated off to make it 200 characters. I can't verify these numbers, they are just observational guesses, especially with the fade and default hold time.
The arguments are as follows:
time: ms value of when to start fading in. It is affected by a fade, which is 1/20th the hold time in ms. bold: 0 is off, 1 is on size: the size of the text colour: The colour of the text in the following form: R.G.B in decimal. Note the period separating values. Like all colorized objects, it fades strangely during the transition between breaks and playing (63 is added/subtracted to each decimal value) hold: how long the text stays on the screen, including the fade in and out. | (pipe character) means a new line
When you submit a new beatmap and do not edit these settings (only BATs can), the following is updated in the osu!.db file and online: [bold:0,size:20]<Artist>|<Name>
The defaults are as follows: time: previous line + 500 bold: 1 size: 40 colour: 255.255.255 hold: 6000
Example [time:672,size:30,colour:255.0.0,hold:1000]Line 1|[bold:0]Line 2 Line 1 will start fading in for 50 ms at 672, be a red color, and be midsized and bold, fading out to 0 at 1672. Line 2 will start fading in for 300 ms at 1172 and fade to 0 at 7172, be white, and large but not bold.
These lines are unaffected by mods and pausing if no lines have any specific time associated with them.
So that's about it. Sometimes even bad information is better than no information, especially if you know it's not 100% accurate to begin with.
This thread is also linked here t/60228 under the announcement (Misc) sections. Changing to standard since It's already being linked in another announcement plus I believe this guide doesn't belong to the announcement section.