My pleasure. Yes, I shall be keeping a weather eye on GTDNext just the same. If/when you do anything to make the context tags easier/faster to assign just let me know.
PS Other users might like to know that one of the surprising things about MLO - which is unthinkably configurable in a large number of ways - is that although it does have a "Next Actions" view, there is literally no decent way to get more than one Next Action onto that view not matter what Advanced Filters or anything else you set up. For larger projects this becomes a real pain.
One way round is of course to have multiple sub-projects but they can get fiddly and confusing. One of the best things (IMO) about GTDNext is the Forced Next button, which solves the problem at a stroke. But like I say, I just can't live with Contexts being too hard to enter!