[PyMOL] Selective valency on bond

Dear PyMol users,

I have a crystal structure of my protein with an unnatural amino acid present. This amino acid has a double bond within it, which I would like to display as such. However I would like the surrounding protein  side chains to not show double bond character. Is this possible at all?

So far, I can either keep valence mode set to '0' and see no double bonds across the whole protein, or set to '1' and see all of the double bonds, which I don't want. 

My question is, is it possible to selectively 'set valency' onto a single bond, or is it a global command which is not capable of this fine-tuning? I am using MacPyMol if this makes a difference at all?

Thanks for your help,
Patrick