I found this site the other day that has been helpful when choosing easing options for tween effects. It gives a good idea of how the object might behave with different ones so you can decide which would be most appropriate for your purpose. Not sure where to post it though, maybe it can go in the wiki somewhere. 
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Great finding, I think these should go right inside GD, next to the easing names.
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can add in gdevelop?
