TODO: Show the numbers on the rules right above the corresponding tickmark. Right not it is impossible to tell which number corresponds to which tickmark on the rulers. TODO: Make the tickmarks of different length / width. Right now they all look the same.
Marking this as a wishlist item since this is not a bug but a request for improvement. Btw the first one was something I was actually thinking myself about; it's especially useful when doing pixel art or trying to code up a Seexpr script (to debug). It's only relevant with small numbers though, I think, when it could be written exactly over the range between the beginning of the pixel to the end of the pixel. For the bigger ranges, like when you have A4 300dpi canvas and you see 0-200-400 etc., it makes no sense to write 200 or 400 over a whole 200-pixels range. So this needs a bit of thinking first (maybe a smart switching depending on zoom and whether it's possible to write pixels number as it was said above, or not? Also suggestion: even when writing pixels numbers as I suggest, it would be enough to write only every second of them if there is just a bit too little space. It should still be easily understandable).