"Assaut Lance" formation (ASC p.151) is the same way; "up to 2 units MAY have the chosen SPA"
I agree with Scotty - the wording is a polite courtesy and does not imply a requirement. We only get permission to assign that many units a given SPA within the chosen formation.
my Rule of Thumb with Support formations: assume the number of units that MAY have the chosen ability as the maximum when assigning the Support Lance formation abilities. For instance: the already established 1:2 ratio means you can have a maximum of 50% Forward Observers in a Support Lance that supports a Recon lances (which must have 100% unit SPA assignment).
At my tables? Unlike Scotty, if the assignment of the ability goes undeclared, whoever had the ability last continues to have it... whether they can use it or not (for Fire Lances, Sniper is wasted on targets outside reach or LoS, Oblique is wasted on targets IN LoS; Assault Lances, Demoralizer is wasted on units outside of movement range, and Multi-Attacker is wasted on a unit without an enemy in LoS).
Again, one simply misses the opportunity to move the assigned ability to someone who would have actual use for it.
Here's my problem with saying that this isn't a RAW issue though. If you apply stacking order , the assault formation is likewise not eligible to give the support formation any special abilities, not because of the number of abilities that is assigned, but because of WHEN they are assigned.
RAW, the support formation checks the formation it is supporting BEFORE play, if multiples of two units in the supported formation have an ability, then that many units in the support formation get that ability. Before play starts, 0 units in the assault formation (or any fire support formation) have the formation granted ability, and thus 0 units in the support formation would get any abilities. This is obviously not how it's intended (RAI), and I never claimed that this is how ANYONE would use it, but nonetheless it IS how it is written. If you think it's not written that way, PLEASE diagram with proof how it's written for me, because I'm only using the words that are there to point this out, not adding content (which is what RAI is) to justify a point.
(p.s. if you add ONE word, it fixes everything, bolded for emphasis.
Bonus Ability: Before the start of play, each Support Lance must designate one other formation type in its army to support. For every 2 units in the supported formation that may make use of a formation-provided bonus ability, 1 unit in its Support Lance receives the same ability. This bonus ability is retained as long as the Support Lance still has three or more active units on the field; they are not lost if the supported lance is reduced below its own ability to retain the bonus ability.
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This is exactly why I dislike calling a Protomech "Star" a formation of 25 and not a collection of Point-sized formations.
Less helpful are Vehicle Stars, which can absolutely do the same thing but can't be organized into Points with the same benefit.
100% agree with this. We have yet to come up with an elegant solution though, if you treat a 'point' as 1 unit, does every point member get the SPA, or just 1 of them?