You are absolutely right. There is also resurrectionRemix Rom available for A860 devices and based on Lolipop 5.X also other ROMs like Cyanogen can be used as reference for code for 4.44.
I was thinking The best ROM is MIUI with beautifully designed interface and many good features.
I like to make MIUI better.
We can also add Audio FX in system of this version's ROM like: Viper4Android or builton MIUI AudioFX.
Also can collect user's wishes and feedback to make this ROM more stable.