I've tried out your AjaxHelper package and find it is a very useful addition for OpenACS. But I am afraid it produces too much overhead.
If I have for example a page where I only want to use that bubblecallout feature - which should be a very trivial one - the loading time of the page increases from approximately 1 second to over 6 seconds!
Perhaps one can reduce the amount of javascript files that are loaded by default to an absolute minimum.