I didn't check lately, but yes the idea of setting a different route per account or per subscription is key for a more private browsing using Amethyst.

Otherwise, the server can just bundle a bunch of filters together and start tracking users even without a stableish IP behind it 

 How would you manage clearnet relay connections? I guess you'd lose the privacy of Tor if some connections goes over clearnet and some over Tor? 

 No clear net connections at all.