Bluesdance -
Thanks for passing along the write-up from Dappered. To answer your question, we try to keep things as simple as possible through our web interface, since most of our customers are able to get a really good fit by using our existing five options. However, we're able to make more alterations, including waist and seat adjustments based on shirt or body measurements. We're in the process of building an "advanced" sizing module for the guys that really know what they are looking for (like a lot of the guys on this forum, I imagine). In the meantime, if you reach out to us via our contact form, we can make any adjustments you might need to get a perfect fit.
http://www.ratioclothing.com/t-contact.aspx
Thanks,
Eric (Owner, Ratio Clothing)