Limit who shows in Sales Team Members dropdown

Does anybody know of a way to limit which Employees appear in the Sales Team Member drop down list on customer -> Sales -> Sales Team tab?

This list shows all active employees regardless of their sales role. I know this is because any employee can be part of a team and that team selling can include non-sales roles.

That's great, but we have a large number of employees, including outside reps, advanced partners and non-human ones for Web Services, that will never be part of a team and they are making the list overly large and cumbersome.