Are float command arguments common? The int helpers were added because practically every plugin with commands would use them. Are there any cases in the base plugins that can be converted as was done with the int stocks?

Im uncertain about other people, but i use float args throughout my plugins. Quick example being development plugins for modifying ent properties. I can peek through SM base to see if there are any arg to float conversions.

Yeah is useful for me as well, sometimes, as JS mentioned, I create commands in plugins to set some netprops.
As a use case, e.g. in L4D2 you can set a burning percentage from 0.0 to 1.0 to change the Special Infected appearence)
Where 0.5 means 50%, etc.