[DSpider]

There was no reason to even attempt this. Most readers do it on-the-fly. Heck, even older Bookr versions from 2007 (Bookr being a homebrew PlayStation Portable reader) can do it. And not just text, images and objects too.

I'd lol at your 2009 reader for not being able to do this.

There has to be an option, firmware update, or even if there isn't, maybe there's a custom firmware that allows this.

Also, I think e-Ink text is better black on white. In theory, the more e-Ink molecules are activated the more the battery drains.