Importing single images to one sprite sheet

Hi there!

I would appreciate this feature a lot:
Import a number of frames (single PNGs)
Stack them automatically on an already created blank Sprite Sheet in Pyxeledit.  

It also would be perfect to be able to define a max size of sprite sheet in height and width, the need here is creating sprite sheets for Unity.
(I currently use GlueIt for importing images to sprite sheet, but it doesn't have settings for size of final image, plus i'd like to use PyxelEdit for all needs regarding sprite sheets)


I just grabbed a copy of PyxelEdit yesterday, hoping that it could import a number of animation frames I already created, unfortunately the only way I figured out was to import images then select them one by one and copy them one by one to the main sprite sheet created (had 20 images per animation created from a modular animation tool (Spriter by Brashmoney, exported in single PNGs)

Thanks!
Karim.
http://twitter.com/karim_designs