How to modify *.conf files?

[Tarjei85]

Its worse than that, actually.

... you will need to root the divice. Android comes in two flavors... one rooted, the other not rooted. If its not rooted you wont be able to modify the system yourself.

I am not sure if Remix is rooted, or if you can root it... to use a modifiable Android you'll need to install the rooted SD img for Android.

marcus

Many thanks Marcus,

Remix is not rooted and can't be rooted. I will then hope the next update will solve some of the issues found.  

An ordinary rooted android could also be an option but I don't like the default desktop setup - It's not intended to be used on a 40" TV / monitor but a small tablet.
Is there a way to fix it? ( The high resolution is wasted by big icons and app headers)

You could try one of the many launchers available for android. I am using the Lightning Launcher for my android setup and it looks good on my 55" tv. 
The reason I chose Lightning Launcher is because of all the possibilities of customization.