I thought this was a feature, but it appeared to be a bug fixed in the Spring v0.4.16-alpha release.
It would be great if a user could have more freedom of where objects snap to the grid. A bit like in Tiled when going through "Edit -> Preferences... -> Interface" to find the "Fine grid division" option (I think that's it).
It allows a user to "cut" the grid's squares and divide the snapping areas.
- 1 would be the square itself with no division;
- 2 would divide the snapping square into 4;
- 3 would divide the snapping square into 9, and so on...
If it isn't clear and more examples are needed, please don't hesitate to ask.