MagicDraw/Cameo: If you drag a Behavior from the model browser onto the SYMBOL of a State (that does not already own the Behavior) and set it as an 'entry', 'doActivity', or 'exit' Behavior a "wrapper" Behavior owned by the State will be created.
MagicDraw SysML/Cameo 19SP3: GOTCHA: If you drag a Behavior from the model browser onto the 'entry', 'doActivity', or 'exit' field in a specification dialog of a State it WILL BECOME OWNED by the State (which "steals ownership")!
MagicDraw/Cameo: On dragging a Property onto another Property set it as redefining, the multiplicity of the redefining Property is set to [0..*] if the redefined (dragged) Property only has <UNSPECIFED> Multiplicity
WISHLIST: MagicDraw/Cameo: Ability to set project-wide option to NOT set the multiplicity of a redefining Property to [0..*] on using drag-n-drop when the redefined (dragged) Property has <UNSPECIFED> Multiplicity
MagicDraw/Cameo: You can drag a Class symbol onto a Class symbol (in a Class Diagram) or a Block symbol or ValueType symbol onto or Block symbol (in a Block Definition Diagram) to create a new part property or value property
MagicDraw/Cameo: You can drag out a Property (or Port) from a Class or Block symbol to create an Association with the Property (or Port) as one end
MagicDraw/Cameo: You can drag-n-drop most applicable Stereotype types from the model browser onto an Element's symbol in a Diagram to apply it to that Element (does not work in all cases).
MagicDraw/Cameo: You and can drag-n-drop the icon for most Diagram types from the model browser onto a symbol in a Diagram to make it the default hyperlink for that Element; clicking on that Element symbol will then open up that Diagram.
MagicDraw/Cameo: You can set many fields in an Element's specification dialog just by dragging compatible elements from the model browser onto the value area of the field.