There is one great Velious tinkered item.
Specifically the Vanishing Device. 5 charges of invis, rechargeable with a mana battery. Between a stack of batteries and the devices that's 105 charges of Invis between two inventory slots. On a Melee or cleric, this is quite valuable. The only drawback is you need to carry a Deluxe Toolbox on you to recharge it.
Once Incarnadine BPs get nerfed to Warrior only (not even worth mentioning SK with CoS so available), you'll see a ton of monks and clerics who need a Vanishing Device.
http://web.archive.org/web/200110240...g/recipes.html
That has two sets of combines. The top set is the current set we have on P99. The bottom set is the Velious additions. Basically is the vanishing device I listed above and the Clockwork armor only warriors and clerics (gnomes) can use. Both of which are rather rare race/class combinations, so you may not find much market on them... Though they are some useful clickies.
Tl;dr - Tinkering is useful for:
Spyglass - instant clicky junk buff
Stalking Probe - cheap recharge Eye of Zomm
Rebreather - Warrior epic and craft able EB
Vanishing Device - Rechargable Invis item