Hell Yeah! It works! 
@gvolt: your step by step Tutorial did it. This IR plugin version seems to be much more stable. I was able to add my own remote data and to activate it via the plugin. And it still works after reboot.
Thank you!
One more Question:
My remote still has one button left that has no function yet.
So, I thought about to add a web radio station from “my web radio” or at least a specific playlist.
If this is possible what command in lircrc needs to be added to “config =” ?
begin
prog = irexec
button = RADIO
config = ???
end