Can I customize the contact lookup in Potentials module to include leads?

Can I customize the contact lookup in Potentials module to include leads?

At our company we're trying to customize zoho CRM to fit us, so we use some things slightly different from the default. When I select "add contact roles" in potentials, I get to the screen "contact roles mapping", and of course when I click on the "contact name lookup" icon a new window pops up for me to choose a contact from.

My question is, can I customize the drop down menu in that window to include Leads? It would be really helpful for how we use the potentials module.