I've been playing around with the RTM API, and I found that if you use a Smart List's ID with the rtm.tasks.getList method, it works great. For example, I made this series of calls:
1. The authentication sequence, leading to an auth_token of 12345
2.
http://api.rememberthemilk.com/services/rest/?method=rtm.lists.getList&api_key=my_key&auth_token=12345&api_sig=
the right sigResult:
<rsp state="ok">
<lists>
... a bunch of list tags
<list id="39989832" name="Today's agenda" deleted="0" locked="0" archived="0" position="0" smart="1" sort_order="0">
<filter>(due:today OR dueBefore:today OR (NOT start:never AND NOT startAfter:today)) AND NOT list:Groceries AND NOT location:brain</filter>
</list>
... a bunch of other list tags
</lists>
</rsp>
3.
http://api.rememberthemilk.com/services/rest/?method=rtm.tasks.getList&api_key=my_key&auth_token=12345&list_id=39989832&filter=status:incomplete&api_sig=
the right sigResult: XML containing the incomplete tasks in my "Today's agenda" Smart List
I didn't try putting the name of the Smart List into the filters since they provide the list_id parameter. But this seems to work properly, so I imagine it ought to be pretty easy to work into the plug-in, assuming you're keeping track of list ID's.
