Another thing I think should be disabled by default on all arm boards is Monitoring. It uses cpu/ram, writes a lot, and most arm users probably don't need the graphing. I disable it on all of the images I have created.
I was talking about the stuff Hardkernel is now using testing with their Cloudshell2:
Yep, those parameters would probably work well on all arm boards. I do have a cloudshell2 to test on now and I have a native Windows 10 box to test with.
Is it possible with OMV to tweak smb.conf's global section without risking to loose the changes with an update?
Yep. Put the options in the extra options box on the smb/cifs settings tab. This will survive updates.