[tnuc]

sure, anything is allowed in your script, what you do in scrip before sending listitem to core is up to you.

but when you call 'xbmcplugin.addDirectoryItem(handle=int(sys.argv[1]),url=url,listitem=listitem,isFolder=False)' and finish it off with 'xbmcplugin.endOfDirectory(int(sys.argv[1])' thats when core displays the list and your script has ended

so if you want to show a list of subs for user to pick the correct one(if I understood correctly) you do that before calling xbmcplugin.addDirectoryItem(handle=int(sys.argv[1]),url=url,listitem=listitem,isFolder=False) and send the picked one to back to core.

I hope that it helps, otherwise I didnt understand