We have an internal ticket about this that arose from earlier requests, but work on improving this has not started and is currently not scheduled, so I can't give you any indication as to when it might happen.
What I can do is add your voice to that internal ticket, which I have done, as well as requested that the priority of this be raised, it is really something that we should offer more control over.
There is not really anything else I can do, I'm afraid.
Thank you for adding my voice to the ticket, Nigel.
I image you have a lot of work to do, but I'm pretty sure this "simple" (nothing is simple in this world!) feature would make the filters much more easy to use.