Filtering events & items on the REST & SSE endpoints is something that would indeed be valuable and solve a lot of problems - and IIRC has already been discussed, though I don’t remember where. It goes beyond HABPanel - and kudos to @arctus for this implementation, it shows how open source empowers people 
- however it might be a little too specific as-is 
(and it should probably be a core feature, not a binding).
The proper way according to the project’s contributing rules would be to first suggest a generic filtering feature to the openhab-core repository, contribute the code as a PR so that it can be properly reviewed and nicely integrated, and then we can see how HABPanel can take advantage of it!
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