@ninrai Oh I was operating under the mistaken assumption that you didn't like the changes personally, but it's so comforting to know you are looking out for the rest of us with your Objective opinions based on your vast experience with eye tracking. We really are fortunate to have you here, to protect us from our own ignorance.
Anyway, you asked if there was an option to use the old style, and while I can't answer that, I can offer an alternative, if any of the changed biomes looks even remotely acceptable to you. There is a way to only generate maps using a certain biome that you can use:
Go to the map generation panel, and double click the word Generate. A new input field will appear, labeled Command Arguments.
Some of the options for the generator must be input here now, which is a bit tedious, but you get access to new options that aren't in the UI, among them being able to choose the biome.
Here are some of the important commands:
--biome (Brimstone, Desert, EarlyAutumn, Frithen, Loki, Mars, Moonlight, Prayer, Stones, Syrtis, WindingRiver, Wonder)
--map-size (a multiple of 64. A 10x10km map is 512)
--spawn-count (number of players)
So if I wanted to generate a whole lot of maps with the desert biome, I could put this in:
--biome Desert --spawn-count 10 --map-size 640
If you want I can dig up the rest of the parameters and their associated values (they're listed on the right, under the map preview, syntax may differ a bit), but most of the sliders still work as expected, i think.