How can take a screen capture

Hi ! I instaled this ROM =>http://forum.xda-developers.com/gala...3-neo-t3099384 on my S3 Neo . After that the combination "Power Buton" + "Home Buton" isn't working (before install ROM the combination was takeing a screen capture)

[Request] Can the 'scrolling capture' feature from the Note 5 be ported to Note 4?

We've already had this awesome screen off memo port but the other great Note 5 feature that I'm jealous of is the scrolling capture one - if you've not seen this yet it's an extension of screen write that can scroll down a webpage and stitch screenshots together, converting them to one long image file that can still be drawn on in the usual way.

In theory this should be an APK, right? Is it possible to port it backwards?