Changing boosted target

I know this is a slim chance of actually being implemented but i figured theres no damage in tryin :)

so heres my idea :
the feature of changing a target boost. For example i boosted my spell factory and now i have all my spells ready but still got time left on the boost. Instead of wasting the boost time i could change the boost from the spell factory to one barracks or regenerating hero.

thanks for your time, and have a great day.