I'll answer your questions below:
> Sure, light weapons won't destroy a door. But when a players uses a machine gun it could do some damage.
a machine gun would make a lot of holes in the door, but it wouldn't cause it to disintegrate
> Maybe you could also make the AI consider the power of both teams and then decide how to behave: If the AI team clearly outnumbers a players team the AI should decide to rush in most of the cases. If it does not it loses its clear advantage. For example I played a match with my own team's score at about 3.000 whereas the AI strength was more than 14.000. If the AI had started to attack with all or most of its forces it would have been impossible to defend and I would have had to retreat. But the AI decided to throw separate attack waves on my position. That is (too) easy to defend. You could define some threshold: If AIs strength is twice as much as the players strength, the AI should be more likely to attack with all its forces.
That make it impossible to beat the AI and it's not very fun to play against an unbeatable enemy
> As we are talking about tactics: I would prefer the AI to throw even more nades when it realizes that a player is camping inside a building. Sometimes enemy soldiers nade the doors quickly. But sometimes they only stand around, waiting to be slaughtered.
It depends on many things whether a soldier will throw a grenade at a door or not. On easier levels is happens less often, because it makes it hard for newbie players. Also, there may be friendlies in the way, or something obstructing the trajectory, or he could be out of grenades, or out of range. Also, sometimes the soldier will try a back entrance to the building instead.
<on PCs with low end integrated graphics physics runs slowly. You could try deselect the "highres shadows" option and that might improve it.>
Yep, that did the job for me. Animations are much better now.
It's also fixed in 1.5.2 BTW. Physics now runs at the same frame rate of the game.
<I could make it right mouse click to create path. Maybe that a solution?>
Yes, I think so. Introducing the right mouse button would make things easier. You could also consider: one mouse button for movement only, the other button only for attacks.
Now that I thought about it, I'm not so sure. Using right click to select something feels very weird. Maybe, I can just add an option to disable the left-click to create path. Also, I can tweak the tolerance to favour shooting when the user clicks near the enemy.
>Another suggestion concerning attack controls: when activating a nade, the green path will show up. But if you find out that the enemy is too far away and you want to leave the nading mode you have to click again on the nade icon. That is not very intutive. I would prefer to click anywhere on the screen outside the nade path to exit the nade mode.
That's a good idea. To tell the truth, I only use the CTRL key, never the button.
Another issue: If a merc throws a nade over a long distance, he sometimes takes a small damage (only 2hps), although he should be clearly out of reach. Is that an issue or intended to be that way?
Yes, it's intended. A grenade does pressure damage and fragment damage and the fragments fly a long distance.
> And another bug: A player tries to open a door but it is blocked by an enemy on the side of the door. The enemy is killed by another soldier in the same turn. Still the player in front of the door can't open it (Open door button is deactivated). When moving the player (for example kneel and stand up again), the door can be opened.
That's a HUD update bug, I will fix it.