You would need to use ItemPerks:Legendary items if you wanted to setup static rolls/skins.
Allows you to create named items.
"Black Ops Kilt": {
"Item shortname": "roadsign.kilt",
"Item skin": 3037708026,
"Restrict enhancement": true,
"Announce in chat when this item drops for the player?": true,
"Send a UINotify message to the player when this item drops?": false,
"List of perks and modifiers that the item has [perk: modifier]": {
"UncannyDodge": 0.15
},
"Description about the item that is shown when mousing over the ownership banner [blank/null = nothing]": null,
"How many armor mod slots will the item spawn with? [won't exceed item definitions max cap]": 0
},
Which can then be added to drop sources:
{
"Loot source": "Woodcutting",
"Prefab shortname, boss profile, event name [null if not required]": null,
"A list of required skin IDs [null if not required]": [],
"Identifiers to exclude from consideration [List - null if not required]": [],
"Drop chance [%]": 0.0,
"Should we consider loot chance modifiers that the player may have?": false,
"Items that can drop from this source [profile name: drop weight]": {
"The Woodcutter's Pride": 100,
"Evergreen Blessing": 25,
"Forester's Edge": 50
}
},
{
"Loot source": "Mining",
"Prefab shortname, boss profile, event name [null if not required]": null,
"A list of required skin IDs [null if not required]": [],
"Identifiers to exclude from consideration [List - null if not required]": [],
"Drop chance [%]": 0.0,
"Should we consider loot chance modifiers that the player may have?": false,
"Items that can drop from this source [profile name: drop weight]": {
"Miner's Treasure": 100,
"Krag's explosive pickaxe": 25
}
},