Hi !
Thanks for your comment
For the cover on the wall, I have already think about it but leave the idea because of technical matter (things on wall are visible from many many place on the map, and you know, the geometry of the map is already a litlle too much heavy, it will cause a lost of fps).
For the window, are you speaking of those in the big house ? The metal box is the safe of the Bank Robbery version, from this room, you can escape through the window (the one with shutter). Just open the shutter, jump out the window while crouching (like you do through many window in this game that are too narrow), and you are out. You can go out to by opening the door in the bedroom and jump in the market place (of course, you need to know that
crouching just before touching the ground allow you to jump from higher without taking damage).
For the attackers spawn, there are many ways to get up the walls, just look at the bot, they know a really easy way to go there
There are a lot of secret in Alamo, one of my favourite that I would share : all the saloon table can be moved to provide some protection against outside attackers