I watched a John Cadoggan (speeling?) video about this problem in Aus, he was really ripping Toyota to shreds about it.
He seemed bemused that Toyota had fitted a manual regen button following problems encountered by customers, which i thought was a good compromise idea, if you've just started a decent journey perhaps the first long run for a week you know thats the time to given the car a regen, the 'puter doesn't know you are doing a different trip that day and it might trigger regen just as you are about to shut off if left to its own devices, best of both worlds far as i can see.
I have the facility to stop a regen on my lorry if one starts at an inopportune time...i drive a blower tanker and it wouldn't be a brilliant idea to have an extra hot exhaust outlet next to explosive atmospheres, and i can trigger static regen if needs be but haven't needed to in 180k, so Mr T has put their system as close to proper trouble free lorry systems as possible, well done Toyota.