The current URL types in the appdata spec seem a bit restrictive. They do very poorly in getting people to inter-active help venues (in particular as the current help type is meant for passive help such as documentation as per the spec).

To improve this I would like to suggest extending URL types:

• forum/helpdesk for linking to support forums and the like
• chat for link to IRC/matrix/gitter/whatevs support venues
• mailing list
• wiki? (arguably falls into the existing help type)