Color Selection fade Time

I use a HedgeHog4 at a venue that has lots of LED's washing a stage. Can I set a delay time when selecting colors in the color filters so there is a 2 second crossover time between colotrs. At present the colors snap over. I do a lot of simple busking with no running sheets so have to wing it.
Can you also use a delay when selecting fixtures, rather than manually fading up with the wheel.
Thanks.