I just added a very simple shopitem category system to the svn. So if you want to test it, grab the newest version from there .

To use it you need to do the following:

Set the cvar war3_buyitems_category to 1. This will enable the category system.
Next categorize all your items in your war3source or server.cfg. Here's a quick example (I don't run any default items on my server so don't blame me if they're not in the right categorys)

war3 ankh_itemcategory "Health"
war3 boot_itemcategory "Buff"
war3 claw_itemcategory "DMG"
war3 cloak_itemcategory "Buff"
war3 mask_itemcategory "Health"
war3 lace_itemcategory "Buff"
war3 orb_itemcategory "Buff"
war3 ring_itemcategory "Health"
war3 Health_itemcategory "Health"
war3 tome_itemcategory "XP"
war3 scroll_itemcategory "Health"
war3 glove_itemcategory "Buff"
war3 mole_itemcategory "Fun"

Now when someone types shopmenu on the server he should get the categorys first and then the items .

The current system is of course still lacking, for example you can't have any translations, but it's good enough for me so if somebody needs something more complex - be my guest. I'm guessing if you wanted proper translatable categorys you would need to add a native to add them like shopitems, change the CreateShopItem native to add the category and so on...

Edit: Something also not possible yet is putting items into multiple categorys. I might add that as soon as I need it