I have to say that I'm enjoying GB MIUI a lot. The UI is beautiful and fast. The regular Android UI just cannot compare, and I'll probably never use another rom on my D1.
That said, my favorite time killers (and my method for occupying my 10 year old on occasion) are not working on 1.4.22. NESoid works just fine, so I'm not completely at a loss for fun, but SNESoid, GameBoid, and Gensoid do not work at all.
I am on the stock kernel with VM heap set at 40. I haven't had any FC's outside of the Miren Browser so life has been great until this little problem.
All emulators worked great on 1.3.18 which I still have a Nandroid for, but I would like to stay on 1.4.22 if someone can help me out with this.