Can I eliminate the autocomplete recommended commands to only those I actually use?

Can anyone tell me if I can edit Rhino’s suggested commands when I begin to type a command?
I only use about 10 commands over and over, and fewer command suggestions would greatly speed up drawing…

That’s not possible, no.
But you can make 1- or 2-letter aliases for those 10 commands that you use. That way, autocomplete won’t get in the way of your commands.

You can also use the MRU command list.
After running a command once, it’s added to the list.
You can access the list and select it by right-mouse clicking in the Command window.
The list is cleared when you exit Rhino.
This tools was the predecessor of the fuzzy autocomplete tool you’re describing.
I use both.