@skorpionbird It depends on what you mean ‘command’
Command for Page increment and decrement is easy enough. That is prepared by other module with simple notification. But By example; for reboot; you need something(module, shell command or script or extern application.) to do really reboot. Then you also need an activator which relay MMM—Hover to that command execution. Hover itself doesn’t have that feature, you should do one of options which is described in above post.