"Is it possible to use “Edit Object Colour” command in conjunction with Face Rule?"
Unfortunately, not really. However, a user on eng-tips (CNSZU) posted a journal that allows you to select tangent faces when editing object color.
IR Description: NX: Edit Object Color conjunction with Face Rule
Your recent call to the Global Technical Access Center, Incident Report (IR)Number 7820371 opened on 28-SEP-2016, has been researched by our GTACsoftware engineers. They have determined that this issue should be reviewed for possible enhancement to the current software functionality.
This IR was converted into an enhancement request (ER) on 28-SEP-2016and is now referenced as ER Number 7820371. It is OPEN for review at this time.
You may view the status of this report through the Create or Update an IR optionon our GTAC Support web page at http://www.siemens.com/gtac. Select the Createor Update an IR option. This tool requires a WebKey username and password. Onceyou are logged into the QTAC tool, select the Search option from the toolbar.
Thank you for contacting the Global Technical Access Center.
The Global Technical Access Center Team
Thanks Ben for verifing. I've missed a step: to show the Journal path.
It's working now. I should go back to Eng-tips and give a star to CNSZU .