jQuery Grid Plugin - jqGrid

Ok, so I implemented virtual scrolling, and it works great.

On this one grid, it takes 1/2 sec or so, to compile the data to send to the grid. No problem, until someone gets click happy.

We get happy clickers, that click the "down" scrollbar, and it kills the server with all the server calls (they can easily queue up 20 or 30 calls).

Anyway of stopping this, so that they can't cause another page fetch, until they've already gotten one from the server? Or at least, until a few seconds have passed?

Thanks!