I'm not sure if this is the right place to put this in, but does this site plan on letting people filter results by roller coaster type as well as by game at the very least?

You can filter by game at the moment, I'd assume if you type a keyword in the search bar it'll pull up results for the coaster type you're searching for. For example if you're looking for wooden roller coasters in RCT2 you'd turn the RCT2 filter on (you have to be searching by track first and then you should see a filter option near the top of the page) and then you'd type 'wooden' into the keywords search bar.

Hopefully this helps.