Rated 4 out of 5 stars

Good addon. The override compatibility is on Tools/Nightly Tester Tools/Force Addon Compatibility
It then sets it for all addons. No longer the per-addon option.
I also only wanted for this, unfortunately Compatibility Reporter (https://addons.mozilla.org/en-US/thunderbird/addon/15003/) is not compatible with Thunderbird 3.3a :(

This review is for a previous version of the add-on (3.0).