Royal Mail Shipping Extension

This is app is good and serves its purpose but to be honest it could be sooooooo much better. It works on an average size of package rather than actual so it doesn't know the dimensions of the package you are sending just the weight and so can never be exact. I'm sure it wouldn't take too much to develop it further to perhaps take into account the dimensions of the products too and therefore produce a more accurate reading, it would improve this app so much.