I'm experiencing issues when selecting text and then wanting to add a stroke - the option for stroke is available in the Style menu, but no colour option is available. I've seen a stroke colour selector on the top bar before now - although not sure if that is just for text box as opposed to Artistic text.
The only way I could get to set colour is to go in to Character, where I could adjust it under Decorations. This does seem to be overly hidden for the stroke function.
I'm running version 188.8.131.522 on MacOSX 10.14.1.