This is a good question as I've also wanted to do something similar to this. Upto now if I'm not mistaking ez only lets you redirect after login,logout and adding items to a basket
You can do this either via ini files:
http://ez.no/doc/ez_publish/technical_manual/3_7/reference/configuration_files/site_ini/usersettings/logoutredirect http://ez.no/doc/ez_publish/technical_manual/3_7/reference/configuration_files/site_ini/shopsettings/redirectafteraddtobasket
or with a hidden field:
<input type="hidden" name="RedirectURI" value="/url/to/redirect" /> (I've used this only in login form)
Never the less I GUESS you can setup a workflow and create an extension that will redirect you...