What driver are you using David? I have 6.5 off the USA Epson website.
I'm away from that computer at the moment, but I'm fairly certain I have a choice of either Color, ABW or Black at the top level of the driver. As long as I select Color I have access to Color Settings which then force me to choose Mode (choices are things like Vivid, Standard, Charts and Graphs etc.) and Gamma (1.8 or 2.2).
6.5 from who knows where. I have the 3800 printing preferences on screen in front of me. When colour is selected under media settings and the mode is "automatic" , then yes, you have those options. As soon as you switch to "custom" and select "no colour adjustment", which should be the default IMHO , then the "advanced" button is greyed out.