I'm leaning Japanese, and so I have my Mac set up for three different input methods: English, and two different Japanese character sets. I can change between the three input methods using ctrl-alt-option-space.
However, because there are three input methods I have to press this key combination a different number of times depending on what the current state is. For example, if I want to switch back to English then I have to press it twice if it's currently set to hiragana, but only once if it's set to katakana. Because of this, I keep pressing it the wrong number of times, which results in typing unwanted characters and then having to cycle back through the three input methods to get to the one I want.
So instead of using one key combination to cycle through the three input methods, I'd like to set up a specific key press for each one. For example, I'd like to set up something like ctrl-alt-command-E that always switches back to English, no matter what the current input method is, so that I can always get to where I want to be without worrying about where I am. But I can't seem to find a way to do this. Is it possible?