I would like to second this request. In particular, I recommend an "emergency button" that turns on all of the lights, or at least, a subset the user can define. Right now, to turn on the lights I have to load the Kasa app and wait several seconds before it can be used. During a home invasion or other emergency, we would want something more responsive. I expect that a widget would launch immediately, or at least, much faster.
You can do that. You will need to create a scene in the Kasa app which will have the smart devices do what you want (all on or all off). When you then select the Kasa widget and you see the various ones we have, move to the next page and you will see the 1x1. You would select that one scene you created to have all the devices perform which ever action you want without needing to open Kasa.