When Imperial Boba, or Navigator, or Stay on Target trigger (just quickly throwing out a few potential examples off the top of my head), there's no great philosophical rules debate regarding whether or not you're revealing, or whether or not you're revealing then modifying then revealing a second time ...
... or is there?
The closest parallel that exists is Daredevil, which also requires you to choose and execute a maneuver from a predefined pool: in this case either 1-turn left or 1-turn right. While it doesn't refer to the dial, it does serve as an example of a case where you choose and execute a maneuver without one, demonstrating that no dial is necessary for SLAM's rules text to work, just knowledge of what maneuvers are on it.
Well it's not actually clear no dial is needed is it? The card does not say 'choose and execute a maneuver *from* the dial' it says 'choose and execute a maneuver *on* the dial' which is semantics but that's the whole confusion anyway. The usage of 'on' rather than 'from' to me implies you are physically picking one maneuver on the actual dial, hence the need to reveal your physical choice to your opponent thus giving the trigger window.
@Blue Five:
You correctly noticed something I did not a few pages back, which is that Daredevil does, in fact, also involve choosing a maneuver (from one of two legal options). I would still argue that this is not an effective rules precedent to cite when debating the merits of SLAM interpretations, for the simple reason that the legal options for Daredevil do not have to be available as ordinary maneuvers on the dial for the equipping ship. So, it's similar, but I think fails to be a clear and unambiguous precedent.
-- EDIT: Ninja'd by Gecko!
@nigeltastic:
I very much agree that there is significance to "on" versus "from", and is probably the most immediate source of ambiguity in the RAW.
The crux of the matter (leaving aside the ruling from Frank for the moment) regarding the rules card is whether revealing your dial is reasonably implied by the RAW.
I guess the broader question is, is implied text common to the game? I would argue that every card that follows the formula, "When you X, you may spend a focus token to Y" has the implied text "a focus token [assigned or available to your ship]". In other words, it goes without saying that you can't just grab a focus token from another ship in the squad (unless it's Esege obviously).
So, do we routinely apply non-explicit, implied text to rules interpretations? If so, why is it wrong to interpret the SLAM card in light of implied text? And following that, then why isn't it reasonable to just chalk up Frank's ruling to frustrating arbitrariness? (SLAM already has the seemingly arbitrary restriction that it cannot be triggered as a free action.)
Edited by PaulTiberius