User settings for things like border-radius
Lucid makes a bunch of assumptions that get in the way of using the product. One of the most annoying things when using Lucid to sketch mid fidelity prototypes is how it adds a border radius to everything.
BUT WHY?!
Other weird things include how you assume all text in shapes should be vertically and horizontally centred, or how when a outline option is chosen, it is immediately forgotten when the next shape is used.