Ability to exclude tickets from capacity calculation

We are struggling to get Omnichannel to behave as we want it. We essentially have two buckets of tickets, sync and async, through both Messaging and email. We recently enabled Messaging's Capacity Release setting but found tickets that reopen count against capacity indefinitely until they are replied to or the status changes. Ideally, there would be a setting that is basically the opposite of the tag to selectively route emails through Omnichannel where you can indicate a conversation should not run through Omnichannel or count against capacity.

We are currently looking at our options none of which are ideal but include changing the status to something else then back to open, which seems to make it inactive, or using a custom hold status for async tickets. Ideally that could be under Open but if it is it still counts against capacity without this feature.