Q1: How do I actually enter the string(s) to enter at the console ? Cut&Paste doesn't seem to work here
Create a file in your base directory (the directory with all the .pk3-files) called whatever.cfg.
Put the string in whatever.cfg.
Type exec whatever.cfg in the console.
Q2: Could you plz give me a link to some docs that describe those strings to enter ? I assume they cause the actor to move to the desired place. That's something I always wanted to have (but didn't dare to ask for).
No, they set tiles if I've understood correctly, I haven't read the source regarding that though so I'm not sure.
Feel free to correct me if I'm wrong.
The first quoted part of the string is the tiles and the second part are coordinates, I assume the coordinated for each respective tile.
Assumptions can be dangerous though... =)