I've just downloaded and installed Construct 2 for the first time, hoping to see how difficult it would be to connect to my WebSocket Server software (http://highlevellogic.blogspot.se/2011/09/websocket-server-demonstration_26.html).
I was happy to see that you've already discovered Websockets and that there might be a place for my technology since you don't support them completely. However, I wasn't as pleased with your description at "WebSockets and multiplayer games" scirra.com/manual/153/websocket
I don't think "reliable transmission" means what you think it means. WebSockets are an http "upgrade" built on TCP; which employs the selective acknowledgment (SACK) option, defined in RFC 2018, to address the problem you mention.
Maybe you're describing a problem with the specific package you mention, node.js?
I'm not saying there are no potential latency issues to be addressed, but if not TCP transmission, what do you suggest?
highlevellogic.blogspot.se/2011/09/websocket-server-demonstration_26.html