I recently installed a package from CLI in debian directly. To start and stop it I took advantage of the "scheduled jobs" feature of the OMV GUI. I create a scheduled task with the command that interests me, I do not activate it. When I want to execute that command I have it available by executing the task manually. I don't need putty.
I wonder if it would be possible to take advantage of this to add a CLI window within the OMV GUI. Thus, commands could be executed without the need for other programs and without the need for SSH. Maybe in OMV 6?