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What is a good threshold for a UI which allows users to place objects, snapping them to a grid? 25% of the grid size? Less or more? Should the user be able to change this?

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I believe it depends on the grid size and object size. I think you should test it against your users. I don't think you should let users change it, but sometimes it could be useful to switch it off (temporary or until it will be switched on again). –  alexeypegov Jan 22 '13 at 19:13
    
you temporarily disable it by holding Ctrl (Windows) while dragging, god I hate graphics editors that doesn't provide this... –  AndroidHustle Jan 22 '13 at 22:18
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Yes, 100% with @AndroidHustle on this one. Photoshop is probably the most prolific example using it today; it also happens to be a feature I love dearly. A good snap threshold for me is around 10-15% of the grid size, any larger and it just becomes too much of a pain. Also, be sure to implement arrow-key movement as well (I use those all the time).

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