OK - I must have another mod that's causing issues then because any edits to BasicExpermiments.cfg have no effect in game.
Example: For "WBIPowerToolsEvaluation" I change the Biome Mask = 0 and Situation Mask = 48 but as soon as I boot into the launch pad there is a "Get Results" available in the right click menu and the biome/situation where the experiment can be rerun are still set to 7/63.