Interestingly enough, Classic Shell is capable of doing this.
See below. (It’s in the Classic Start settings, and you have to tick the all settings box too.)
The “Disable active corners: All” is what did the trick.
“MordernUI Tuner” is by the same author as the mentioned Skip Metro Suite (WinAero), but purportedly works with Windows 8.1 (Update 1).
ModernUI Tuner is my latest tweaker which allows you to change few hidden but very useful options of the fresh Windows 8.1 Feature Pack/Spring Update 1.
It includes specifics for tuning how apps are closed:
Start8 from Stardock also has this capability when choosing the option :
Settings > Desktop > Disable all Windows 8 hot corners when at the Desktop