There is another option to enforce this rule without relying on users. It would require a little bit of work on Brandon's part, but it would be a permanent solution.
If the server-side script could wrap a DIV element around each signature and apply the CSS properties:
Code:
max-height:200px;
overflow:hidden;
then the browser will make sure each signature does not extend beyond the 200px limit. Max-height, I know, is supported by Firefox, Netscape 6+, Opera 5+, and Safari 1.3+. As you probably realized, it is not supported by IE at this point. However, IE7 has finally added support for it, so nearly all web traffic will support it in a short while.
I am personally for this option. This will not only solve our issues of perpetual scrolling, but it will force people to keep their signature size down to the limit if they want them to be seen. And as for our IE friends, they will get the benefits soon enough.