Round Color Picker

If you can't wait for the feature (because this first needs to even be a feature request, then needs to be requested by enough folks and then needs to be built), then just get MagicPicker for a couple of bucks: https://anastasiy.com/colorwheel 

@Apple_Apple3924 wished there was an upvote for that request! That is an awesome idea! 

Yes, you can do feature requests here:

https://illustrator.uservoice.com/