Sure its possible, if we threw a whole heap of money at our developers to implement it! Sadly though (and we are just being honest) we need to earn some more money before we implement this option.
For now, each time a new job is listed and it meets your criteria you will receive an email. On the plus side, each time you get an email it could be your next job!
If for any reason you decide you are getting too many emails just delete your Job Alert and set up a new one with a modified criteria.