While the DSTwo is more powerful than DSi mode, it has a weakness that Dsi mode doesn't, it needs to transfer all the data back and forth across slot-1, which is limited. Another World and others have mentioned it before, that's where the problem is. That's why it's not as good as it should be, and why there's slight button lag.
There are no current plans for those emulators for this card. In fact there's nothing planned (that we're aware of). I mean the team can't even keep a forum up, you want to rely on them for emulator updates? Better off bribing a third-party dev to do it (homebrew bounty).