No, meta.discourse.org does not belong to Trimble. It is a company that created a forum engine (programmed in Ruby) named Discourse. Other companies or persons can use the discourse engine for their own forums either on their own site, or hosted by and on discourse servers.
The SketchUp forums (AFAIK) happen to be hosted (transparently) on discourse.org servers, but are accessed via a subdomain
So, if you want new core features for the Discourse forum engine, you need to convince the people who “own” Discourse. If the feature can be implemented as a Discourse plugin then first check if a plugin already exists, and if not request it in the proper category at https://meta.discouse.org.