I don't disagree the GO's should have the same colour override options for foreground as background, but the custom colour option is a new feature that is a work in progress with foreground to follow at some point.
In terms of current workflows there are numerous ways to expose the furniture including:
1. Simply changing the display order position of the zone stamp backwards or bringing the furniture forwards.
2. Change the Zone Settings > Floor Plan colour & fill override settings
3. Assign a GO for each Zone category
If you need a unique foreground colour you can add it to your pen set where you have access to the RGB values.
Apple iMac macOS Ventura / AC26UKI (most recent builds)