Ok I don't know if any more information has been found out about the "create item" script but I have some discoveries of my own. I opened the file designeritems.erf (DragonAge\packages\core\data) with microsoft word 2003 and it was able to decrypt the first couple of pages.
I tested the following scripts:
1 runscript createitem
2 runscript createitem bec100im_duncan_longsword.uti
3 runscript createitem bnd300im_prisoner_clothes.uti
4 runscript createitem bec100im_wedding_f.uti
5 runscript createitem gen_im_acc_amu_am16.uti
and so on and so on....
Anyway every script returned "success" however nothing was every created, at least that I could see. Maybe I am using the wrong codes or there may be a different script for creating equipment.
"Createitem", though a valid command line, is not in the script for the action. You can get a mod from DA Nexus that will allow for "additem" in place of "createitem" that works a treat. If you have the DA toolset, you can get any of the codes you desire and you can also change the properties of those items if they are enchanted as you see fit doing it from a game save.
Here is the Link to the mod.