That's exactly right - the Synology DiskStation Manager (DSM) is the OS for Synology DiskStation and RackStation products, just like QTS is for QNAP products.
Thank you for all your advice - what a wealth of knowledge! Based on the above, I think what I've done (i.e. torrent client through the VM) is probably the best solution for how I use my system. Everything's working well. Really appreciate your help
Thanks and it's pleasure to try and help.
As an old friend of mine once said "the best choice is what's fit for purpose and simplest" (well, I changed it a bit but the gist is the same).