Hello    @LegendaryFire 

Thank you for starting a feature request. 

Here is QA that explains why it is not recommended to use current smart bulb with a dimmer.  (including a smart switches with the dimming capability),the way of dimming can be conflict or not compatible.  Q9:  Will Smart Bulbs work with a dimmer? 
https://www.tp-link.com/support/faq/1391/

While scenario,  you describe can be achieved by setting up smart action between Kasa switch and bulbs,  Control with a Switch , when turn on the switch, you can turn on a bunch of smart bulbs , this is done by automation between kasa smart devices. 

Common questions about Smart Actions in the kasa app