Hi Crymage,
I don't know if it is possible to change the default copy behavior, but as an alternative, you can consider
to make a tool button (for example, in the Custom Routine button,
http://www.originlab.com/www/support/resultstech.aspx?language=english&ID=655),
which contains the following one line LabTalk command:
menu -e 38798; //Copy in Full Precision
Hope this helps.
--Hideo Fujii
OriginLab