Bookmarks

Hello, here I am again after a while without any problems...

I use FF3 portable (great!) for 3 weeks now and have a problem with my big bookmark list (3000 and more). In FF2 I tagged all my bookmarks using the addon "enhanced bookmark search". I used the field "keywords" and not the field "tags" to assign my search words. This addon doesn't work in FF3, so I can't search in my list now, because FF3 only allows to search by tags, I understood.

So I have a few questions:

1. Is it possible to get all my keywords copied or tranferred to the tag-field?
2. Is it possible to create a tag for all bookmarks of one folder at once?
3. Is there any possibility to change the search behaviour in the config?
4. I miss a suitable addon to manage tags and keywords, anyone who knows?

Thanks for any idea!

Edit: found a solution for 2.: AddOn "Tagging For Multiple Bookmarks" (experimental)
or "Tagsifter" (migrator).