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This is still very limited.
Thick brushes (i.e. thick jungle, thick maple, thick taiga, etc) all exist on the same layer, so you can only have one of those per map (if you have two, both will just spawn a merge of the plants that appear in both of them).
Cacti also spawn with thick brushes, so if you want a separate Cactus brush then you'll have to deal with cacti randomly spawning around the perimeter of your thick forests. I'll provide an option download without cacti enabled as a workaround.
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I'm unsure if you can actually increase the density of these brushes, that's a question for Kai, but either way using his other mod you can simply manually place additional trees to fine tune the density as you see fit.
plus my idea seems impossible