I too am a converted and long time Franklin-Covey user. The system is great, but their software stinks so I gave up a few years ago and find Michael Lineberger's Outlook system.
Linenberger's system works great and saved me from task overload, but it lacked the Franklin Covey system touch.
I then did what timk did - I created the A B C and a D folder then used the Toodledo 0, 1, 2, 3 priorities.
This way, I get the effect of Franklin Covey sorting and best yet, I get the folder views to look at what is important that day (It works great on my Windows 7 phone App too - See Linenberger's site for that info on the To Do App!)