control the size of Datum1

[uwam2ie]

I want to set up the datum1 in ordinate dimensions origin from part defaults. I'm able to to so for the standard size d= 10mm, but I can not setup a size d=3mm. Is there something like size control string for the datum1 - scaling or any ideas?
thx in ad

 

[cstauffe]

Also have been wondering this, but as far as I have seen there is none.

 

[uwam2ie]

thx on reply
i solved editing the ug_standard.sbf file -very tricky