Lebanon blends a fertilizer with Dimension and Confront 3 all in the same bag. It is expensive though. I think it is around $28.00 - $30.00 per bag (40lb / 10,000 sq ft coverage). You can kill 2 birds with one stone with this type of product. Find a local Lebanon dealer and ask them about it.
Lebanon SKU# 2153580
19-0-6 33% Mesa W 0.145% Dimension & Confront 3
Whats next, they gonna start telling you which way they want the lines in the grass? How they want there shrubs trimmed? Or maybe the "right way" to trim a tree. Whenever I go to HOA meetings and the "smart" guy in the corner has some great ideas about the products I should use or how I should do something specific, I always smile and say "I will have to look into that". Its a good thing I have it in all my contracts that the only input I am obligated to listen to is the Property Manager. I dont know what I would do if every "master gardner" on the board had me do it their way. Good luck buddy, its only the start of great things to come.
Oh, your right. They want a pre-emergent and a post emergent in one.