Photoshop: How about a frequency separation tool or brush?

I would like to see a frequency separation tool/brush. I know we can use an action to set up frequency separation but wouldn't it be smarter to have a tool that could work on an empty layer without all the extra steps? The tool would have all the adjustments of a normal brush, one form would work on texture and the next would work on color and tone. I would like to hear from a developer if this is even possible.