War against the soviets and winning as the Germans should be a category. Winning against china as Japan is another good one. Denying the rhineland against Germany, and capitulating them should be a cat, and don't even get started on Kaiserreich... it should probably be its own game. These are BASIC categories that I made in 5 minutes thinking about what is needed. A winter war category also sounds nice.... but it depends on what the limitations are. Setting a start date for a war will make new speedrun strats possible. Saying you can only war the soviets in 39 makes SENSE and could be 2 categories.

"Attack soviets" is quite long would be a category like german blitzkrieg which isnt played much A campain in china would also be quite long. If we need a long land campain I would take china. Rhineland would be possible but its not that different from "oppose hitler"

Kaiserrreich: Kaiserreich is a mod, which makes it harder to control if other mods are used.

Setting a late Start date for a war: would combine speedruns more or less. the optimal way to defeat the soviets in 39 is to annex other countrys before that to have a better front or more production. And Im pretty sure you are able to get super speed divisions until 39, Russia wouldnt even be hard.

Winter war? As soviets or as Finland? Would be a 39 start if we would do it, if I think about it it would be a mix of poland and ethiopia :/ To play as Finland would always take 6 months for white peace, to win against russia would take to long/would be to hard

I will ask Wanuke about a China category, but he is right now not really active.