Approvals - show only active team members

It will be nice to have an option which allow restricting users visibility to list of only active team members.
In case of big teams it is little bit annoying when you must scrolling through long user list where a half or even more are no longer part of your team, if you want to verify another user data before approving its timesheet.

Were this list is located:
find a team -> go to approvals -> use option View Timesheet for some user or just click on user name -> try to change user by clicking on a downward-pointing arrow located to the right of the username located in the upper left corner