If it can be done, it should be done in the settings. But I'm afraid there is no satisfactory setting for repeat delay and delete speed that will work to your satisfaction.
So you'll have to change the keyboard driver. That's a job for a Linux programmer, because that is open source. And then it works at your PC if you boot it into your own variant of Linuix.
That's the way to do it.
I want to ask if it possible to double input my keyboard for every keys, for example: when i pressed "a" once, the input in the computer should be "aa".
Anyone knows how to make my keyboard to double input?