Is there a quick solution to add more buttons?

[335th_GRAthos]

I thought of something, I think I read somewhere about it but could not find it again:

An easy way to make more keys could be to add an extra USB-keyboard or an extra USB-arithmetic keypad (I saw one today, they sell them as add-on to notebooks which have no arithmetic pads).

Would it be possible to add a second keyboard and allocate different functions to its keys?
(I need to put keys for the heating contol of a twin-bomber's engines and it is a nuisance).


~S~