Adobe AIR Flex / ActionScript URLLoader vs HTTPService (asynchronous tokens and Windows proxy settings)

I will try to keep it.

I wrote an AIR application that uses an HTTPService to request various bits of data. Several services can be started at the same time, so I use the standard AsyncToken behavior to set variables, which can later be used to track what happens when the call returns.

However, some of the people / places we are deploying cannot directly see the server on which the XML is stored, although they can view its contents through Internet Explorer. Using URLLoader automatically uses IE proxy settings, so switching to this class solved this problem. The problem is that it clearly does not support tokens.

Is there a way to force HTTPService to use IE proxy settings? Or is there an easy way to apply markers to a URLLoader? I thought of several ways (including class extension), but I want it to be as simple and clean as possible.

I saw the discussion of Flex - URLLoader and HTTPService (among other questions and sites), but it seems that I can not find anything that directly answers what I am after, so any help would be greatly appreciated.