*1. The book says that at the end of the active player round he/she removes one token from each recharging action card. Does it include the cards that he's just played? For example, Grom the Dwarf uses Shield Slam, succeeds, he places the tokens on the card, his turn is about to end, he removes one from the card?
A: You remove them from EACH recharging card. Yes, you remove the first token from Shield Slam essentially right after it is played (that round).
* 2. Are there any rules for disengaging? The rulebook says only that you must perform a manuever to do so, but some cards seems to indicate that it's not as simple an you may be attacked (for free?). Or it really is so simple and I'm reading too much into the cards?
A: You need to spend a Maneuver to disengage, otherwise you can have the monster attack the PC. If the PC has already used their free maneuver, they will need to gain a Fatigue to get the extra maneuver.
* 3. What's the point of Rally Step? I understand it's role between combat encounters, but for example a small combat encounter is over, the party gets into a town, rests for a day or two and starts and investigation. In the combat the priest used healing spells and block cards - are they on recharge for the whole time until the next combat occurs? How does it work? He can't cast healing spells multiple times after that combat?
A: Rally steps were designed to break a combat in half so that the players get a chance to regroup if things getting hairy. They are not essential to running a WFRP game, but some careers or actions have abilities tied to the Rally Step.
A: The "Resting in Town thing" is deliberately vague and up to the GM to decide how long a character can recover. If the GM says so, you can't just sit around all day and use "assess the situation" or all of your healing spells over and over and over. ALL GMs should decide exactly how this is going to work in their games in general