That was a pretty silly tip, all kana input methods that I know of use shift for katakana. But here's a better tip.

One of the big problems with Command-Space to change input methods, is that it overrides Adobe apps that use Command-Space for zoom. If you hit Cmd.-Space to zoom in Photoshop, for example, you just get inputs switching and no zoom.
The trick is to not use Command-Space in Adobe apps, but instead do Space-Command. If you hit and hold the Space key before Command, you still get zoom and keyboards will not switch.

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