Well I need to remind you this IS considered beta!
The locked topic issue is because SP does it the other way around. Zero means unlocked. I have corrected that in the latest cut of the importer. Odd that this hadn't been reported by anyone previously who all said that the data came across fine! Oh well.
I have also changed the latest cut to remove the option of importing users. If they already exist in the target WP table then they are NOT re-imported but the actual import process ensures that their forum membership record is created correctly.