Yep, sure.
You can add extra fields in DB and by mentioning them in connectors config - make them available on client side. After that you can include them in lightbox form to make editable ( with auto-saving back to DB ) or create custom filtering rules based on those custom properties.
The example for filtering object seems to be on the clientside. I wanted to achieve that the events are fetched from the db “filtered”. Meaning that only the desired subset of events (which comply with the current filter) are fetched and send to the client (serverside-filtering).