The dewalt 611 should be set to number 1, going faster will not benefit the carve, it may damage bits and it’ll certainly wear the brushes prematurely (btw id get an extra set now if I were you, that way you’re not waiting when they do go out)… the set of 4 (2 pairs ) is like $10
https://amzn.to/3ojbSjv
Regarding Manually controlling it, yes, it would need to be manually turned on and off, however the router can be controlled automatically with a device called an IOT relay.
For the longest time they’ve been on Amazon and ebay, but they both show sold out… heres one on newegg:
https://www.newegg.com/p/1B4-02Y6-00005?item=9SIAY4BEF49881
There’s lots of threads about them in n this forum, this one shows the wiring pretty simply 