Kristian,
I said there is no solution in GDL Editor, it is true. But for this problem, there is a much better, safer solution with using the lpxmlconverter. Setting the defaults for a complex library should be always done from source, professional GDL development can not be done without that, sorry. You simply do not have enough control on your objects without the source format and the checking/finalizing functions of the converter.
Gergely Fehér
Team Leader, Library Team
GRAPHISOFT SE