I have created a video detailing this issue, and it is viewable at: https://www.youtube.com/watch?v=3sGXTmiGfgA

Basically, when dragging a UI element, the game waits for your mouse to move five pixels before updating the element's position. This makes pixel-perfect UI alignment virtually impossible. Please fix this, make it so that the when I drag an element one pixel, the element moves one pixel.