you are right about that, but many ppl in here are asking now things about ui-modding
and rfactory is the best start-off of basic ui-scripting i have found in the web
there are good explanations about itemDef's, rects, alignments and ui_scripts
in my eyes its better to look around there for some hours by yourself (not you Tally, i mean the beginners :] ) instead of hunting your ui-mod-wishes with closed eyes.
just look around there and compare what is done in cod2 and youll know what is possible
http://rfactory.org/
there are 2 sites, the tutorial one and the documentary one
but btw, i would also go with Tally, do a menuDef with 640x480 and a menuDef with 640x480 that will close when clicked and just draw your menu above the close-itemDef