In the base game, and in pegasus, whenever multiple cylon ship acivations appened (like on the super-crisis where all four icons can appear), it didn't really matter what order or whether the icons occurred sequentially or simultaneously.
In Exodus, however, multiple icons are more common, and the whether they occur sequentially (as the appear on the card from left to right) or simultaneously can greatly affect the game. (note I am NOT talking about a icon in the card text and the lower left corner as those are clearly sequential. I mean multiple icons in the card text).
Example: both basestars are on the fleet board, card with both basestar icons appears. Do they trigger at the same time resulting in one basestar moving from cylon fleet to main board (or both of them moving, if it is truly simulataneous)? Do the trigger sequentially resulting in the one basestar that moves getting activated by the second icon? There are countless other situations where the answer to this question can greatly affect the disposition of the cylon forces.
We've been playing sequential for the sake of having a rule to go by. What have others done?