Is there a way to configure GTK word boundaries?

[Damien Radtke <damienradtke gmail com>]

GTK programs like gedit and Tomboy use numbers and letters to divide between words, e.g. hitting Ctrl+Backspace on abc123 will just delete the 123. To me, the standard behavior for word boundaries is to stop at spaces and punctuation and to treat all alphanumeric characters equally. GTK's method is especially annoying when programming or handling serial numbers, when mixing letters and numbers is common. Is there any way to configure GTK (or more likely, the pango backend) to change how word boundaries are detected?

To make it even more difficult, I use Tomboy on Windows at work, and would like to be able to configure it there too.

Thanks,
~Damien Radtke