P7 of the rules, basic Hero Turn Summary: Hero player gets 2 actions, chosen from the following list: Move, Attack, Use a Skill, Rest, Search, Stand Up, Revive Another Hero, Open/Close a Door, and Special. Heroic Feats are not listed, although some do require an Action to use.
Actions include the following statement: "Unless noted otherwise, an action
must be resolved completely before the hero performs his next action."
The Move action summary states "The hero moves his hero figure up to a number of
spaces equal to the hero’s Speed. The hero may interrupt
his movement with another action and then complete his
movement after the other action is resolved."
This is explained further on page 8, but essentially states the same thing. The Move action is both the generation and then spending of movement points. It may be interrupted by another action, such as attacking, but also including using a skill, opening a door, another move action, searching, or a quest specific special action. Once the other action completes, the movement action resumes.
Heroes and monsters have the option of pooling their movement points by taking a double move action…but doing so risks losing all those points to the proper OL trap card.
The rules are unclear as to how suffering Fatigue for movement works. This statement from page 8 seems to capture it best: "During his turn, before or
after resolving an action or during a move action, a hero may suffer fatigue
to gain movement points."
While this doesn't solve the problem of whether suffering Fatigue for movement outside of a Move action pools, it seems that when done during a move action, the movement points would pool. Although the FAQ still requires the hero player to identify which spaces are moved into using fatigue, as some OL trap cards likely will be triggered off that condition. But the POINTS would seem to be pooled, so the hero still has them to pay or avoid certain OL effects.
One question I have is whether, in response to an OL card, can the player suffer Fatigue to gain extra movement points? I think the answer is no. Likewise, if a hero is using his last movement point to move, and the OL plays a card that will stun the hero if he has no additional movement points to spend, can the hero use his second action (if available) to declare a Move action and gain those additional movement points, and avoid the stun effect? Again, I think the answer is no. Which would create a situation where a hero might want to interrupt his first Move action to declare a second Move action. Right before using his last movement point, he declares the second move action, preventing the chance he might be stunned, but minimizing the chance that he could lose all of his cumulative movement points.