In a previous post, Ken Case
mentioned meta-data support, similar to that of OmniPlan. Seems to me that all of these feature requests that fall outside "GTD Proper" (prioritization, tagging) will be handily addressed by this extensibility, without getting in the way of users who don't need them.
Bluecoat93, you really have 500 actions in your @Online/@Computer contexts? It sounds to me like you either need to be more granular (@Photoshop, @Coding) or take advantage of sequential projects. Surely most of those 500 tasks aren't actionable yet.