Whenever I click the color pikcer in Illustrator the H is automatically selected, I usually work with HEX colors is it possible to have the HEX # automatically selected upon opening the color picker?
If you access the colour picker by double clicking on the fill or stroke colour in the toolbar then the hex value is selected by default. The little radio button next to H (Hue) may well be highlighted (or a different radio button, depending on what you were doing last), but the TEXT in the HEX box will be highlighted as in the following screenshot... So, if you're just wanting to tap in a HEX value for a new colour then you can double click the fill (or stroke) in the tool bar, type your value and hit enter. Done.
The Illustrator on the Mac in front of me is version 19.2.1 (2015.2.1 Release) so I can't vouch for any other or more recent versions, but I'm pretty sure that has always been the behaviour and hopefully this is still the case.