Craft 2: possible to control plugin triggering order?
Unfortunately, nothing I'm aware of for Craft 2, I'm afraid.
In Craft 3, there's still not a great solution, but there is a $append parameter where you can kind of force it to go to the top of the list: https://github.com/yiisoft/yii2/blob/master/framework/base/Event.php#L103
But that would stop a plugin that was loaded after yours to use the same parameter and come out on top.