Hi Igor, while playing with your Armbian and kernel to squeeze even more juice from my cubietruck, i would ask you if you think it would be possible to add to your kernel and u-boot build the support for KVM.
Here one experiment with KVM:
https://rwmj.wordpress.com/2013/12/13/kvm-working-on-the-cubietruck/
Then, partially related with this, it would be nice to have the watchdog enabled to fight the occasional low level hang that happens sometimes (all freezed with 4 led on).