Special characters custom shortcut

I want to create my own keyboard shortcuts to insert special characters that I’m used to.
Examples include using Ctrl+Shift+:, a to get ä, or Ctrl+’, a to get á.
I’m using Ubuntu 12.04. Actually defining this system-wide would be useful to.

I’m expressly not interested in any other method, including clicking on a character on a character map, using a single special-character combination to include all characters of my own definition, or using the lengthy numeric codes on the numpad.

Never mind, I just bought and installed Microsoft Office which doesn’t treat me like a special-needs user.
Also, you’re making me sign in to this forum by giving an 160-char url every single time? I wanted to let you know you’re idiots, but your crippled feedback form doesn’t accept my captchas. So long!

This is more likely an issue of keyboard layout customisation under Ubuntu than a LO-specific question.

Dear @moronic,

In this forum there are almost 9000 “idots” as you call the people. The rate is growing in average with about 500 more “idots” every month.

Did you ever consider the huge amount of very helpful answer people from around the world get every day from other “idiots” of this forum?

Did you ever have a look at the karma of @oweng? (This by the way is a good indication of the top quality of answers oweng provides every day as an unpaid volunteer!)

Do you still think you used the right words?