update_editor_menu – GeanyLua is capable of sending signals to other Geany components. So it could send a signal to a component that could interact with the menu. Or a user may wish to take some other action that doesn't require direct interaction with the menu. Lack of creativity does not make it useless.
key_press – Are you having a real problem with the signal, or is this just hypothetical? On a properly functioning system, checking whether the file exists takes a negligible amount of time.

On my computer, it takes just under a second on average to check for a nonexistent file a million times (code at the end of thie message). That's about 0.001 nanoseconds per keystroke. That amounts to about 4.38 min of processing for someone typing at 100 wpm for a year non-stop. I've already lost more time just reading your messages than I would have lost to the plugin over many years of normal use.

#include <time.h>

clock_t begin = clock();

for (int i = 0 ; i < 1000000 ; ++i) {
  char * file_does_not_exist = g_strconcat(geany->app->configdir, "file_does_not_exist", NULL);
  g_file_test(file_does_not_exist, G_FILE_TEST_IS_REGULAR);
}

clock_t end = clock();
double time_spent = (double)(end - begin) / CLOCKS_PER_SEC;

msgwin_status_add("time_spent = %f", time_spent);

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