I have been reading and translating the latest reactions on the original russian forum where this firmware was posted.
Enlace roto eliminado
From what I understand the using the SD card as main memory does work on this firmware.
Here I found a tutorial on how to set the led notification for Whatsapp and other apps; http://www.forocoches.com/foro/showthread.php?p=147726514#post147726514
this way its easy to root
use google translate
http://lenovo-forums.ru/topic/2269-root-права-lenovo-a850/
2 ways to root one with pc and one without pc
This possible solution for installing apps to ext sd is from Cappa it works but in my case I was getting errors on google play to stop and some apps to stop. but
installing Navigation to external sd Worked. maybe the final solution needs modification of some more files? maybe a dev can look into...
I have been using ROW rom from the beginning (for 2 weeks now) it is a very good, fast and stable rom
Led notification for tekst messages and mail work not for Whatsapp and u cannot set external SD card as default storage.
It is a great rom!