[dx4100]

I downloaded Unshaky to help this out:

https://github.com/aahung/Unshaky

You can set custom timings per key, which is useful for particularly difficult keys.

[GordonS]

It's good there are 3rd party solutions and OSS solutions such as this, but on principle, if you pay way over the odds for Apple hardware, you really shouldn't have these problems in the first place