Simple question:
is the ".stackable" item property the same thing as the "Stackable 1" tiles.cfg config file directive?

Unfortunately, that property doesn't seem to be in the latest POL docs on the website. Atleast Chrome's "find" function couldn't find it. I believe that POL Core reads that property from the tiles.cfg file that is generated during a "realmgen" with UO Convert. The tiles.cfg file is created by reading the properties of items listed in the tiledata.mul file. Unfortunately UO Fiddler seems to have the "stackable" property misnamed as "Generic" in the "TileData" tab.

As a side note; my son told me that he can modify the tiledata.mul file in his UO client to set items that are not normally stackable and have them stack when he plays UO. I haven't tried this and I don't know what version of POL is running on the shard he plays. I know it is running POL but that's about it.

Yukiko wrote:Unfortunately, that property doesn't seem to be in the latest POL docs on the website.
...

Yes, there is: http://docs.polserver.com/pol099/objref.php#Item

*smacks head*
Silly me! I was looking in the itemdesc.cfg file section and not the object reference section.
Thanks Xeon.