We think that:
1) Gestures on apps (abstract glyphs sepcially) are cumbersome to develop. Read more http://bit.ly/ZTCwBb.
2) They should be cross platform so you don't have to code each time on each platform.
3) They should be web-based.
4) There are private APIs and few people/companies are deciding about their use.
5) Should be opened so everyone can create and share.
6) Should not interfere with your app at any extend.
Given these arguments:
Would you use gestures on your app if would be as simple as draw online and use everywhere?
At gesturekit.com we are taking care of these six points and want to provide a very simple way how to use them and implement them.
Thanks very much for the feedback, we appreciate. @gesturekit