Customise image sizes on EB ?

Hello

Not sure if I should post this on the "feature request", sorry if it's not on the right category :/

I have a question about image sizes on Easyblog. If you upload a picture, Easyblog create several size of it (Icon, thumbnail, small, medium, large, original). I'd like to know if there is a possibility to change these size. For example, I guess medium resize to a 640px width, and I'd like 600px instead, for each new pictures uploaded. Is it possible?

If it's not, then is it possible to add a new size? Like, I create a new size that I will name "Custom 1", and each time I upload a picture, EB creates an image with this size?
(I underlined "each time" because actually you can, but only for the current picture

I'm asking this because resizing a picture on Easyblog is - sorry to say that - a nightmare at the moment, and I end prefering to use the resizing tool of JCE, that allow me to enter a specific size for a picture. It's not optimal, but the result is exactly what I want, since there is still a problem with resizing a picture on EB