Hi!
Are you talking about the slider on the main screen or the one in the device details dialog? By default that slider doesn't show up on the main screen so I wanted to double-check.
Personally, I think the slider control on a 1x1 tile is just too hard to control -- like you said; also for me testing I accidentally kept hitting it. That's why I removed it by default.
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By default, clicking on a light will toggle on/off. You have to long-press on a light to view more fine grained controls like brightness, color, color temp. But at least these sliders are a lot wider so it should be easier to touch. That said, I will add a way to enter a direct value by clicking on the "Brightness" label (see second image below)
