A very usefull enhancement (at least in our environment) would be the ability to apply content filters based on Client Computer Groups.
AFAIK, you can only filter backup content using subclient filter or global filter.
A feature you may want to review could be Subclient Policies.
Subclient Policies provide a means through which you can configure multiple file system subclients within a CommCell from a centralized template. This alleviates the need to manually configure each file system subclient that shares a similar configuration. Subclient Policies are especially useful in large enterprise environments where configuring many similar subclients individually would be both time-consuming and impractical.