Allowing multiple homes/warps in /sethome command

Hello, I'm setting up a basic command suite for a private server and would really like to expand my /sethome commands to allow for up to five homes with custom names. The problem is that I can't find a way to let the command parameter data block accept a custom parameter that isn't already defined, for example "/sethome mobfarm", as opposed to me setting five pre-set parameters that the player can't change.

Is there a way to allow a custom parameter in a command like this, or do I have to do it the boring way?

Thanks!