I've been chasing quotes for a segment of what you require: auto end date. I emailed gossamer and others listed in the Resources page and I got no response from gossamer, most of the ppl listed as installers and modifers no longer do links work, and one person that I contacted (anthrorules) turned out to be incapable of such a simple project.
gossamer has a lot of potential, unfortunately they and the majority of installers are too unprofessional to be relied upon.