The Alt+W copy key binding does take precedence over the toolstrip mnemonic that selects the view tab. If you press Alt and then within a second press W the copy function should be invoked. If on the other hand you keep the Alt key pressed for more than a second before pressing W then the toolstrip mnemonic will be activated.
If given the above, Alt+W copy doesn't work consitently for you then you can disable the toolstrip mnemonics using the following command, which you can put in startup.m if desired:
>>com.mathworks.desktop.mnemonics.MnemonicsManagers.get.disable
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