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I think, it's a good idea to enable "snap to shape" by default in Sirius diagram. If some users want to disable it, they can modify the corresponding preference in "Sirius/Sirius Diagram/Rulers And Grid/Snap to shape for new diagrams".
There will probably be specific cases for sequence diagrams, as said in the documentation: "...IMPORTANT WARNING: To work correctly, Sirius sequence diagrams must have a tight control on where the graphical elements are placed on the diagram and on their synchronization with the underlying semantic model. This means that to use sequence diagrams you must: * Disable the Snap to Grid behavior. For an existing diagram, this is available in the Rulers & Grid section of the Properties view when the diagram itself is selected. You can also disable it for all future diagrams in the preferences: Sirius > Sirius Diagram > Rulers and Grid, un-check the Snap to grid for new diagrams check box."
A patch is available here: https://git.eclipse.org/r/32845
Fixed through http://git.eclipse.org/c/sirius/org.eclipse.sirius.git/commit/?id=be469c7bd6cd33b06751df7ae3ca2fcaac8cf26d
Available in Sirius 2.0.0.