Dwarf trait

[Mantwerp]

Personally I think we can let geneticists have nice things that people want to get.

I originally thought so too, but as I've said in the post above, it can be a major character trait for some gimmick characters, and having it be an incredibly unlikely chance to get just kinda sucks. Lord knows how many rounds I've wasted spending my entire time in genetics, not being involved in any part of the round, just sitting still in a gene pod, just because I wanted one of my gimmick characters to look the way they're supposed to. 
So sure, it encourages some more people to go to genetics, but this is not out of their own volition (there is no alternative method of getting dwarfism except maybeeee radiation but that's even more up to chance and far more dangerous), which is very much not a fun thing to have to do every time you have an idea for a character which would not look very good if it was of a normal height.