Probably a non-issue to majority, but it's annoying the crap out of me. I keep clicking on the wheels only to find out that I've actually undone it because I'd already clicked it earlier.

Since I'm red-green colorblind (most prevalent kind) it's hard to distinguish hues in those color components. These are the colors : 132r.154g.167b & 16r.189g.187b They mostly differ in exactly those (red and green) color components. I wish they'd differ more in blue so I could actually see the difference.