Allow for a root command to be used on its own even if it has subcommands attached to it.

[DavidPHH]

I'm transitioning toward slash commands and hit a wall with some features:
I have a jail command that mutes someone based on X reasons, I also have some dozen subcommands attached to it.
For instance I can do jail @someone to mute them, or jail info @someone to view information. This doesn't seem to be possible at the moment with slash commands.

[damccull]

I would also like to see this capability. As a minimum, allow setting one of the subcommands (without any required arguments) as a 'default' to run in the event that no subcommand is provided. This is important to me to provide an interface much like a CLI command works, where the main command does something default (even if it's just to provide help) and then options or subcommands (or both) can be added to the end of the command to modify its behavior.

[Ernest314]

Setting a subcommand as the default when no subcommands are specified seems like an elegant solution. I love this idea.