Hello everyone,
Everything worked for me well.
It may not be as clear as that, but everything is there.
Tutorial:
For the PostPlace Mod, (I understood by trying every key and option) You must check the 'choose block' box, then point any block, and press P.
Then, use U,I,O,J,K,L like you use Q,W,E,A,S,D to move the block. Check the 'rotate' box and use the same buttons to rotate the part.
NOTE: Your modified blocks won't be saved. The trick for this is to add another block, place/rotate it, then add the block you wanted to modify at first (like a propeller) on the block you just placed.
If you want to be precise, check the 'use fields' box and type the values you want in the HUD.
The NoBounds Mod allow you to type any value on weapons, wheels etc. (Even negative values!)
I don't know a single heck about the last one...
Fun trick!
If you go on the appdata of Besiege, (right click on the Besiege Icon, then 'open in folder') Besiege_Data > NpcNames,
you can open the list of names and surnames of soldiers, peasants, sheeps and chickens that appear in the game when they're killed.
(The surnames and first names of humans will be randomly associated)
You can open the texts, modify names, add some, close the texts, restart Besiege and they will appear in the game!
You're welcome