with open source ones. LED notifications work thanks to the integrated ButtonLED application.
You can select the SD card as the default storage
Instructions for installation:
First flash Linerty´s rom S116 or S121 (to double the amount of DATA space, ie. for better partitioning)
Then install this ROM via recovery (md5sum: 05ed1d5272ad2c80cf207587d4fc9fff recovery.img)
Alternative Download link
After first boot allow root permissions to ButtonLED and configure it for LED notifications (Except in the Lenovo A850 the led is green/led, the first option in autolocate)
More info on 1st post (Spanish) here