OK. How many buttons do you need? (Also, we should say that these are unlikely to be actual metal because that could make it difficult to get radio signal in and out of the device. They are more commonly metallicized plastic.)
There is a line of zwave scene controllers available from a couple of different companies in the UK, including popp and devolo. These typically have press, long press, and may have double tap. So you can get anywhere from 4 to 12 scenes from what looks like a two button device. Here’s the DTH for those:
current device handler: 1.7.4, updated: 28/03/2017
current smartapp: 1.6, updated: 25/01/2016
What you can do with this
This allows you to correctly set up Z-Wave.me , Popp, & Devolo Wall controllers and Key Fobs. The Device type alone will mean that they work as you (& ST!) would expect and plays nice with other apps, and if dimming is important to you this accompanying app will allow you to have dim events performed whilst rocker switches are held down. Other actions (like double clicks and click-holds) can be used with the Smartapp as well as CoRE.
Some info on the Wall Controllers
These wall controllers are very cool. You can buy the inside part, cover plate, and rocker switches separately, so you have a hell of a lot of flexibility in terms of how they end up looking. For example,…
The Remotec90 is another Z wave device with eight buttons, giving you up to 24 scenes, which is very popular.
Remotec ZRC-90 Scene Master - Button Device Supporting 24 Unique Button Commands
This is a very small button device that has a contemporary look and is wall mountable. With the included mounting bracket you can pull it off of the wall and use it like a remote.
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Button Commands:
Buttons on this device support 3 modes. Pressed, held, and double pressed. When using the device in SmartApps such as Rule Machine, you would use the functionality of button 1 - 8 like normal. Configure triggers on Button 1 pushed, and Button 1 held, etc. But then you can also configure buttons 9 - 16 in Rule Machine as follows:
Physical Button Double Pressed & Resulting Button Number
1 = 9
2 = 10
3 = 11
4 = 12
5 = 13
6 = 14
7 = 15
8 = 16
Preferences:
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Multiple “held” events on botton…
I know neither of those are exactly what you’re looking for, they’re just the closest I can think of that work with smartthings.