You understand that you didn't really removed it, right ? You removed the possibility to configure it and the button to activate it, that's all. Anyone hitting one of the four activation keys still have the possibility to skip.
And even if you removed the key binding related to it, the feature will still remain and can still be enabled from the console. So, removing the possibility to configure it just make it harder for players ; all those who'll know how to manually activate it don't necessarily also know how to manually configure it.
Then just use the
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function. It exist especially for cases like this one. And if you fear that the player have configured it to keep skipping after choice, you can also directly force it to stop before the timed event :
Code:
$ renpy.config.skipping = None