Unstable and problems while using

Hello,i am having some complaints with Synfig Studio.The problem is that your software is highly unstable,I am using windows 7 and it is causing me problems and also you must include some more features or improve some,for example it would be better if you work more on onion skin feature and also include draw and animate like pencil2d so as to make your software much better and it would also push you to number 1 free animation software.Hope you understand and work more on it.