[Q&A] How do I change the apps listed in Extended Power Saver mode?

Hi all,

As the title says, I'm looking to change the apps available from the Extended Power Saver mode screen. This came about as I use a different SMS app rather than the HTC default. My prefrence would be to be able to change the app name/icon and where the tile points to - however I will accept if I can point the "Messages" tile with the HTC icon to a different program.

Any help appreciated!