I have a version of the wiki local that works without the nested set datamodel (also minus some features). This will be committed in a week or two in the 2.2 branch.
By the way, those bulk operations are simple UPDATE statements and I don't think they should force any database driver to commit the transaction.
Sorry, it was a warn and not an error.
Then, I don't know why the menu is nor running well. After some time working with the directories and the menu the items does not appears more in the screen.
I developed a lightweight version of the menu in order to solve the problem.
Which new features or changes are you preparing?