The default config was changed, but no new options were added. You can check out the changes on Github: https://github.com/Olexorus/WitherAC/commit/c042261e0829136e3b41828a59be8743e3faaf24

Changelog v0.13.1:
- fixed a speed false positive when entering/leaving a boat, horse or minecart
- doubled the default notification delay
- added a min-server-tps setting to the packet speed check to prevent false positives during big lag spikes
- increased the fly and speed leniency to reduce false positives, in my testing all hacks were still detected without any problems