Just because it's more flexible does not make it incomplete.
Think of it this way. If you download this with the numeric value inside the /command and a player that doesn't know how to use it tries to, they are going to guess to try /clearspam right away. It's not user friendly to have an unexpected and required extra part with no in-game cues. Ever have an event that you needed to use that you've had for a while, but when you go and use it, its got two or three empty boxes and you have no idea what to put in there? Yeah, same thing. Unintuitive.
Not to mention, owners of the mod would more than likely forget about the added and required number over time forcing them to either go back to the addon topic explaining how to use it, or to write the instructions down somewhere. This has happened to me more than once and is extremely annoying.
It would not be a "pick up and use" addon at that point and I strongly suggest either going the extra step and adding an RTB pref, or just hardcoding the limit.
