Lancelot,
There are no real benefits from adopting a policy of keeping real memory usage to a minimum regardless, if you have plenty of it to spare. In fact in many cases the use of more real memory can bring advantages in performance, and Teatimer is an example of this.
The default mode (conserving memory) allows it to be used "as is" by a wider range of users, however if you do have 1GB to 4GB memory now common in newer machines, then the alternative mode using more memory (but still really a drop in the bucket) gives a significant performance improvement.
Whilst fairly large, the following thread will give you some background about some of the changes to Teatimer.
http://forums.spybot.info/showthread.php?t=30994