Glide is too trigger-happy, consider requiring a key being held to trigger it

[InvisibleSymbol]

• It triggers on the right side of my second monitor all the time. Personally, I would expect it to only trigger at the right side of the first, main monitor.
• It also generally triggers when I try to aero-snap Windows to the right side of my Display, try to close a Window by moving my mouse to the top right or even just use a scrollbar.

I would love if I could set a key that has to be held to trigger the gesture, like Ctrl or Shift. I'm aware that a Shortcut exists, but I do actually like the gesture, it just triggers way too easily.

Version used: v0.5.0-beta.1

[goosewobbler]

@InvisibleSymbol what is your monitor configuration? Main could be either side. It triggers within a fine region on the right side of my left monitor (arguably not desired in a multi-monitor setup) and more reliably on the right side of my right monitor.

[goosewobbler]

This may be related to #806