Okay, so far, in here, I've heard a lot of whining, and not really a lot of meat for suggesting.
bluh bluh ban all autoconverts
First, what ARE autoconverts? I'm not a "mania" purist - I'm casual as crap, I only really started getting a smudge more pp-happy in the past like... ...month or so, and even then, I just want to try to keep over 100K - not an overly hard goal.
Second, assuming that there's mania-specific maps, removing "autoconverts" removes
a lot of viable maps, and you may as well kiss 99.9% of the song list goodbye with that kind of mentality. "OH LOOK EVERYONE, LET'S MURDER THE SAME TWENTY SONGS!" isn't something I really relish sitting behind, no offense intended.
osu! is about fun, and osu!mania shouldn't be much different, and singling things out isn't entirely fun. Taiko's singled out, and every attempt I make to play that mode casually ends either in frustration, disappointment, or otherwise feeling inept - the casuals are kinda singled out.
rank _k scores separately
How about "no"? There's debuffs for altering the Ks, and the bigger difference in Ks translates into a bigger dip in overall score. I appreciate the sentiment, but I think that the debuff that we currently have is good enough to keep things from getting too farm-happy for everyone.
Now then, onto my ideas (note, they're guesses, I don't know what the actual algorithm entails):
1) Develop a formula for average density, and pace - to factor into the possible "stars" (let's face it, having "slow parts" will make a difference no matter what, "skipping" them requires database/resubmitting tweaks that I don't think the dev team wants to really do). ie. [*] = note density x (bpm/120)
2) "amplify" the current star rating? I'm seeing literally NOTHING over 6 stars in my list, and I think that several maps are potentially of 7+ star status.
3) (may also be under 'gameplay', and since I don't know the origin of osu!mania, this can be ignored) Alter how 'spinners' function (perhaps similar to Taiko, but limited to just the 4K bindings for spinner input)? I notice that in really spinner-happy maps, they turn sad-easy.
...And I went braindead. Oh well, current base is good.