Filter More Than One Level Down

Please enable filtering more than one level deep.  For example, I set up a section for role assignments with contact and role.  Role has a boolean for determining if the role is appropriate for a specific process.  I can't filter an assignment selection in an edit page based on the boolean in the role. I also can't filter for more than one role.  Currently, the only way to handle this without development is to allow any assignment to be selected, then use a process to monitor the selection after the record is saved, which is suboptimal.