Add a button to the user interface

Definitely possible. I have added a new action for requested access. Its some what involved but each piece is not too hard. You need to defined a new action in the "header actions" model which you can extend in config/actions/custom-actionModels.xml and define your action in custom-actions.xml. What I am showing is a variation on "add to Team" customization that you can find discussion of here: How to add a custom action to the home page "Quick Links" menu in Windchill PDMLink.

Hi @VC_12193528,

I wanted to see if you got the help you needed.

If so, please mark the appropriate reply as the Accepted Solution. It will help other members who may have the same question.
Of course, if you have more to share on your issue, please pursue the conversation. 

Thanks,
Anurag