Add a colour wheel to standard Web Interface?

Hi, 

Is it possible to add a colour wheel to standard Web Interface?

The idea is to have a new tab that will have a colour wheel. This is needed because quite often the client wants to to change "red" to "even more red". With a colour wheel they can adjust themself and say to me "this is the one". Or I can stand next to them and adjust as needed.

So the colour wheel has 100% dimmer and overrides all other triggers while in use. I only have RGB fixtures over 5 universes. It also shows the chosen RGB values. This will need a button to trigger all triggers for same day from 00:00 we could revert back to what it should be. 

If a colour wheel is impossible to make, is it possible to have an R-G-B override option, so I could just write 0-255 value per each colour and apply it to see the result. Something similar to making a colour in the timeline tab. 

I have an installation, where my controller is in the cellar of a building and I don't see the colours when testing effects in live mode. 

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