@all : thanks for the quick replies !
@pito : where's the easiest place to put changed fuse settings, only for my 'breadboard' variant ? (I reply to my own question : this is already done, my barebones is already working on a breadboard with no crystal) : in the sketchbook/hardware//boards.txt file.
@CrossRoads : Thanks, that's exactly what I needed - I got lost inside the file. Works great. Thankyou.
Thanks again,
Glenn