there's nothing you can do, except bind keys in other way, so you don't hold down only a-z, but buttons from different groups. (something like shift + ctrl + alt + 3 x a-z + something in numpad + arrows should work).
my laptop supports only two chars pressed at a same time, now that's very annoying, but i don't think that's enough to consider it a shit buy, you will get used to it...