For the "once per browser session" control feature, there's this thread discussing this already. However, it's based on modding v1.03 versus the current v1.1, though the process is actually exactly the same.
Attached is the modified v1.1 dhtmlwindow.js file with session only pop up ability added. To get this window to only pop up once per browser session, throw in a new parameter at the very end of open():
Code:
var googlewin=dhtmlwindow.open("googlebox", "iframe", "http://images.google.com/", "#1: Google Web site", "width=590px,height=350px,resize=0,scrolling=1,center=1", "recal", "sessiononly")
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