I was seeing about B-type and it seems to me that these are the most interesting modes, as they demand a certain skill mainly from DAS players. So I've been thinking that these B-type speedrun categories might be attractive.

it would be cool. but perhaps a bit limiting to choose only those 2 combinations. Another idea is to have a Lv 18 B-Type Speedrun. and a Lv 19 B-Type Speedrun where you can pick any height yourself. less experienced players can pick 18-0 and more experienced players will pick 18-5 since that is fastest. same with the Lv 19 category. that brings out a lot more strategy in your pick and a clear path to progression in you PBs