Erik,

The motive:
http://learnvimscriptthehardway.stevelosh.com/chapters/10.html
The idea is to force yourself to use a faster escape key.

Gary,

the output of that command:
    
  timeoutlen=1000
  ttimeoutlen=-1

I guess the final answer is the one from Randy Morris:
https://stackoverflow.com/questions/8488232/how-to-disable-esc-and-cursor-keys-in-vim

"In conclusion, don't remap escape, I almost guarantee you will have unexpected consequences."

It feels like <esc> and some other keys are a combination of other keys as Erik
pointed out.

I'm going to send an email to the author of vimscript to add a warning or
something like that.

Thanks for all the help again guys.

Best,
-- 
Felipe Martins Vieira
Public PGP key: http://pgp.surfnet.nl
Key Fingerprint: 9640 F192 63DA D637 6750 AC08 7BCA 19BB 0E69 E45D