Feature request: Grid Overlay

[RTbecard]

First, I just want to say this program has helped me so much in doing research!

Would it be possible to implement some sort of grid-overlay toggle? I'm using the rotation tool a lot, but I do find it difficult to figure out when my document is correctly aligned. I currently zoom in and scroll so a line of text runs along the bottom of the program window, which I then use as a guide. For me, aligning the document is a very time consuming process.