dw modification: xhtml tag closing

[simmerdown]

Is anyone familiar with modifying Dreamweaver to close tags with the XHTML-compliant trailing space and slash [e.g. <br />? I was told that it's possible to edit one of Dreamweaver's .js files to have it do so automatically, but I haven't been able to find said file.

And last time I checked, no spiffy extensions on the Macromedia Exchange. Can anyone point to me an additional resource or two?

Thanks much.
david