Logging mouse movements on Web GIS application

Hi guys,

I have a question for you.

I'm trying to migrate a small stand-alone interactive java GIS
application to a web set-up. What I have to do is take user's mouse
movements and layer actions (on a vectorial complex dataset) and log
them on the server to run some calculations on them.
Do you think it would feasible on MapServer (http://mapserver.org )? I
was thinking of sending AJAX calls from the browser to the server, but
would it be possible to get a reasonable accuracy?

e.g. The user logs in, looks for a cinema and clicks on it to see its

The technologies I intend to use in the backend are Java and PostGIS.
All the rest is pretty much open to anything suitable.

Thanks for any hints,
Andrea