The Problem

It's hard to do a dashed line. Right now i can only manually remove bloks from pasted line to make it dashed.

A Solution

//line might have a 2 additional parameters wich can be //line pattern [size] [Number of dashes] [length of a dash]
If "number of dashes" parameter is specified (=n) the line will have n equal parts with every part missing second half of the blocks.
If "length of a dash" parameter is specified (=m) then every split part will fill m amount of blocks, instead of a half.

Anything Else?

It would be nice to get it to work with //curve as well.
It will help automate a lot of manual work such as making road markings, fences and pretty much everything that requires a rhythm.