OK, I looked at the screencast, but I have not installed kiwix. However, the project looks very interesting. For myself, as a regular WP editor, being able to get wiki articles from a particular area of WP would be very interesting
I realise that this is probably out of scope, but it would be interesting if:
1) Kiwix can generate its own zim files based upon a spidering of WP articles or by WP categories (eg using wget)
2) Kiwix offered a "view-source" option. This would allow for manual editing of pages of interest in a text editor, which could later be uploaded to the net.