If you need any help with european portuguese, just let me now, i'll help asap :D

That would be nice, but you cant jump nor crouch in the hl2 mod, they are bound to their keys, but cant use them

Maybe you already know, but by lowering your field of view, sniping becomes a bit easier to do, and the puzzle box becomes a bit bigger, so it is easier to solve a puzzle from far away, like in swamp.

I am not sure, but i think it works with all barriers.

The setup that i know is like you put the jammer down, line up with the barrier and move just a bit to the opposite side of where the jammer is, you click forward 3-4 times, and grab the jammer.

Here is an example:

It can be a bit tricky, but not difficult to get it.

Good luck with your runs :)