Almost no one plays AR or OD 10 because few people actually enjoy it.Yes OD10 sucks (because if the map is 5ms or more off it make it really hard and most of the maps are 5~15ms off :/).
But AR10 isn't a problem at all. Actually there's a lot of people who likes AR10. I'm not a pro, just a good player but I play AR10 most of the time and it's easier than AR9 on the fast and hard maps. Also AR10 isn't easier with hidden when you're good at it.
I think AR10,5 isn't really necessary except for the hardest maps maybe but AR11 is just unplayable ;_;
And AR9,5 would be really great yes.
AR8,5 would be really useful for the 150~200bpm maps.
Also Circle size 4,5 for insane maps and 3,5 for the easy maps would be great
I don't really like circle size 5 because with HR---> lol circle size 6, too small most of the time.