re: dev board search. It might be hopeless to get sharp to give out the old database (possibly for fear of privacy issues, since the old database will contain registrants emails, passwords, and private messages).
So it might be worth it to just install a search script on the mirror directory to search it as flat files. This will at least help searching for old posts.
Another alternative (might be very time consuming though) is to write a php import script, to suck in the old posts as ZUG posts. Too much work, I think, so a simple search script looks attractive, something like phpDig, etc.