1) To pick up ammo or use a location you have to stop, correct? You're not allowed to move one space, discard a card to pick up ammo and move again. Except of Santiago with his special ability.
2) If you roll an omen with the standard pistol or the lancer assault rifle. It counts like you have rolled another hit symbol. These omens are no auto hits/wounds. Correct?
3) There is one card in the encouter deck which forces you to spend one ammo token and then take all weapon markers. I'm not sure how this card is namend in the english version. But the textbox of the german version ist not clear to me. Does it mean I spend one ammo token to get all the weapons or do the weapon markers get removed from play?
#1: Yes. You can take a special action (pick up weapon, use ?, revive) between two pips on an Order card, but can't interrupt a pip.
#2: Yes, they can be blocked via shields. Even the Hammerburst Omen can be blocked by shields. Few others can't.
#3: It means the active COG has to discard 1 ammo from his pool + all the dropped weapon markers on the map are removed. If you're low on ammo, it can be pretty nasty, but usually you have Snub Pistol ammo to throw away for it.