Great, but not without its flaws

Look, I love this app, and use it for practically all my editing needs, but there are some issues I would like to address.
1.) whenever I import a png/render, the app will usually add an ugly gray line around it, thus degrading the quality of my work.
2.) whenever I merge layers or export my photo, the quality seems to go down like the Titanic.
3.) I would like the ability to turn the rectangle masking tool.
4.) multiple layers please!!
Other than these complaints, its a wonderful app with lots of useful features for edits of any caliber.

Books_R_My_Life about Superimpose