QGIS » QGIS Application

Hi, I try the nighlty version of QGIS 2.9.25 and I have a problem with the size method in graduate symbol. The size method should be in categorized symbol and unique symbol but not in graduated. This is the first problem because we can't give a size to class in graphic semiology, each different value should have a different size.
The other problem is the mathematic calcul for the size, actually it's false, the right calcul is radius = square root(quantity/pi) we can after that multiply or split by a value all the radius value. To solve the problem of really small circle we could choose a minimum size for value under a custom limit. For the big circle we can choose a max value for the radius and find the most appropriated ratio between the max value we want and the radius initially calculate. I hope you could understant what I'm trying to say.
This is very important because the proportionnal symbol are really essential for cartographer and legend associated too.