I feel like dominion is severely lacking unique features for a permanent gamemode/map and BMB was barley a featured gamemode so it would be nice to add the black market and the brawlers to dominion to add a little more variety
Brawlers wouldn't work because a minion-focused feature in a minion-unfocused game mode makes for a confusing contrast. BMB items wouldn't fit without some balance work (e.g. Flesheater), which would probably be better spent on adjusting the existing balance of the map.
Furthermore, I'm not entirely sure why you feel Dominion of all modes is lacking in unique features. It's the mode that's least similar to all the other modes. Everything else can roughly be described as "SR, but with a little difference."
