Yes, I recognize that maybe I'm being a bit over-zealous with that, I know that at least while having phpVirtualBox page open (even if you leave the page open alone, I did it and in some 1h maybe the log got with near 1MB size) the log gets written every few seconds... but yes if you don't browse it very often then it should not be a problem. Anyway I just didn't liked it and found weird that we can't disable the log with the --logfile param.
Another thing, not related, I did found that with the lainie package and instructions on this thread (as far as I can find it), no symlink is created for /root/VirtualBox\ VMs to store it on the pen, then vm configs get lost after system restart, despite they get listed as list seems to be on .VirtualBox (that is actually symlinked), we can workaround that on our do file anyway as I did above.
Just a question, do you think it's ok to store vm hdd images on the unraid array? I'm currently doing it, as I have no cache/spare drive currently, and so far it seems to work very well.
Thanks lainie for the packages and all the others that contributed with instructions to make this work easily.