I'm using the bromolow version 6.0.8 package on DSM 6.2.2-24922, it works but i've got the following problem:
When I want to create a host-only network in preferences phpVirtualbox locks and even DSM is unreachable. It somehow seems to disrupt the networking.
After a reboot DSM and phpVirtualbox are reachable again and no host-only network is created. I'm not sure in what log file to look for problems.