Speaking only from my own experience here, but...
don't most "standard controllers" (AKA "simple timers" ) simply do this via an A,B,C,... schedule? I know my old one was set up in such a way. The option of setting up multiple schedules with Rachio seems congruent, if that's all you're referring to here.
With that said, I can assure you Rachio isn't satisfied with just being "congruent", and would rather continue being advanced and innovative. That's about as far as I can go, without making promises on behalf of the company's product & development teams.
Just as an option, I'll return to the IFTTT recipes and a "work-around" I used this Spring for fresh grass seed.
I simply linked IFTTT to my calendar (Google Calendar in my case, but there are other options) and set my recipe's trigger (the IF portion) as "Event from Search Starts" - and programmed according to my needs. This way, every time an event with a specific phrase like "water grass seed" began, my chosen schedule would run.
The simpler option, of course is as @tmcgahey suggested.
In my case, I already had enough schedules set up and only wanted to add one more for the seeds to get a quick surface watering.