For your information, @pierre-gilles has already reworked the integrations page: much lighter and faster catalog, display as you scroll, and no misleading counter during loading. This will be in the next version of Gladys:
For filtering, part of it is already possible today (category, Native/Community, Local/Cloud, Gladys Plus, “Installed” view, “Newest first” sort). The other ideas from this topic are noted, thanks @StephaneB for the summary!