Please share your experience addressing deadlines within the framework of the GTD system.
For context, I am new to GTD and just finished the book. David seems to divide tasks into those that are either "Calendar items that need to be completed *on* a specific day or *at* a specific time" and "Items that need to be completed when possible." He seems to completely gloss over items that do not need to be completed on/at a specific day/time but that need to be completed *by* a specific date/time. In other words the concept of deadlines for actions - like one might find on a project plan or work breakdown structure - seems to have be ignored.
The closest I see to acknowledgement of deadlines is a footnote on page 151 stating that it might be dangerous if one does not view his/her outstanding bills often enough (the bills are tasks not calendar items). I deal with a large number of deadlines and such a gap in the GTD system would render it of little use to me.