User configuration of "Early Start"

It would be good, if WE could set how long it takes for OUR ROOMS to heat by 1˚c (each room should have it own setting), then early start may actually be useful.

Time to heat by 1˚c: 0hrs 30mins

So if the room has a target temperature of 19˚c, and the current temperature is 16˚c, early start would kick in 1 hr 30 mins before schedule time.

Even if the room would take 30 mins to reach the 1st 1˚c, but then only another 30mins for the remainder 2˚c, it would give us a setting to tweak until we where happy(er) with the result, even if it was not perfect, it would be better than what we have now ?