Unfortunately, I don't believe so... aside from maybe adding something into the name of the property...
There is no concept of keyword / tags in Adobe Launch (that could be a good idea to submit, but there's no guarantee that Adobe will add it.
You could create a separate documentation file that provides insights for each property... but that's not available to filter all properties with "x" or "y"
If I were you, I would consider a naming convention... Take something like your existing names, and add something like "(PV, C, FS, CE...)" to the end... I am using shortforms to keep the names shorter... but you could add the relevant details to each property, and add to that name if something new is added....
So you might end up with a list of properties that looks like:
- Property 1 (PV)
- Property 2 (PV, C)
- Property 3 (FS)
- Property 4 (PV, C, FS, CE)
Then if you need to find your properties with Form Submits, you can search for "FS".. this still might pull up other properties with those letter combinations... if that is an issue, you might need to get a little more creative with the naming convention, like using "R:PV" (for rule: page view) or "R:FS" (for rule: form submit), etc....