In the group I was when playing online games were some people very happy with keyboards that could make macros simulating series or combos of pressed keys like "nostromo". If I don't remember wrong that could be automated as well. But I think that would be too expensive and way complicated to be used by kids.
Others went to software solutions to make the same, using normal kayboards. There are many of them, like
macro recorder[
^],
jitbit[
^],
autohotkey[
^],
winautomation[
^] and so on.
Hope you find something it helps you