Hi Gustaf,
xoWiki is amazing! xoTcl will be a great addition when fully integrated in OpenACS 5.2. Thanks for your support and sharing.
File-selector as you implemented using xinha plugin is a great idea.
A problem i had trying file-selector:
OacsFs xinha plugin files in acs-templating/www/resources/xinha-nightly/plugins/OacsFs
were not commited to oacs-5-2 branch. They are only in HEAD for now.