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J SHIFT P SHIFT P ENTER
GP2Xpectrum does this for its LOAD button. Of course it fails if something is already on the input line ;)
I'd need more than the above example though to consider implementing it so for the moment it's just an idea.
I have felt when playing adventure games that it would be nice to extract certain words and place them perhaps along the bottom of the screen for selection. This would make adventure games more accessible and BASIC programming more productive. It's not a fundamental feature, but a worthwhile and welcome one.