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I'm not sure I'm submitting this to a correct component ... but one thing is weird when using the expandable field to write code in Evaluate Expression. If you press watch the whole content of the window will appear in watches. However, when you try to edit it you need to use a watch dialog without expandable field. Therefore I think if we are going to implement this feature in new expression evaluator ... we should consider the expandable field in watch dialog as well.
A drop-down button with several last expressions is planned as mentioned at http://wiki.netbeans.org/DebuggerVariables70#section-DebuggerVariables70-Watches