Let's look at this:
If the effect of a card or special ability requires
you to perform an action and you cannot, you
must perform as much as you can and ignore the
rest. (See limit.)
If the effect of an event requires you to discard 2
cards from your hand and you only have 1 card in
hand, just discard the 1 card and ignore the rest.
If the effect of a card or special ability requires
you to choose one of two different actions, you
must choose an action that you are fully capable
of performing (if possible).
I think the key words here are
requires you to choose. What sorts of cards
require one to
choose? Let's see here...
Desperate Defense of the Ring.
The Free People's player has to
choose whether to discard three cards from hand or add a burden.
Now read the context of the ruling again. The sentence applied on Gemp to
Slaked Thirsts comes directly after an example of a case where you are forced to discard two cards but can only discard one. If required to
choose, you can't do that sort of thing. i.e. in the case of
DDotR, you cannot choose to discard three when you only have two cards in hand. If forced to discard (like
TWAoL) then you do as much as possible and call it enough.
Or what about...
Worry.
You are required to
choose to either exert the Ringbearer or add a burden. You can't choose the former action if the Ringbearer is exhausted since you can't complete it.
My thoughts are that this ruling really doesn't apply to cards like
Slaked Thirsts or
WoBaS where it just says wound/exert a minion twice. No "choice" is required in the game text. Furthermore, even if a choice is implied,
you are not choosing one of two different actions. The action is set (wound/exert twice); you are choosing the
minion.