Hey there,
Big fan of your work in this beta, you keep surprising me everyday.
Now as a total order maniac, I like my icons perfetly aligned, and I think that the tag could be upgraded with a simple feature: use square icons.
As showed in the following picture, my thermometer is only 9px wide and 24px tall. As my icons are aligned using the 'item-right' option, they are not "center" aligned. This would be solved by having all the icons having the proportions "24x24".

However, if there is a solution to my problem, I'll gladly use it.