They should have applied for a software patent if they came up with a brand new idea by themselves. Except they didn't. Here's an article on the same feature in software released well before the App Store existed:
http://incopysecrets.com/fun-with-text-macros.php
In fact this kind of thing has been around since 1989 at least:
http://www.ettoresoftware.com/products/typeit4me/
>Available since 1989, TypeIt4Me is the original text expander for Mac OS.
Google 'text macros' and you'll find dozens if not hundreds of ways this feature has been implemented into different applications and operating systems. Hardly 'concrete evidence'. Why on earth should Apple be prevented from implementing it just because some guy already made it for their OS in a less effective form? Why should they pay him a penny if he didn't come up with a single original idea?
Or, you know, ignore all that cause I'm obviously just an Apple fanboy.
I had the opposite problem, whereby clicking didn't register with the application - it was driving me crazy. First I thought it was my wireless mouse, but swapping out to USB mouse didn't fix it. So then I slowly started removing running background apps. After a slow process of elimination I pinned it down to TypeIt4Me - removed it and the problem went away. Might be something similar in your case.
Typeit4Me. Text expansion is literally the most day to day useful thing you can set up.
I haven't used this app much yet, unlike most of the ones I submit.
It has a pretty good reputation behind it and I had heard of it multiple times before though. I figured at $30, I could live without it. I don't do enough typing to make it worthwhile. However for $10, I could definitely see myself using it on occasion. More importantly I have family members that could take real advantage of it.
Same as the other Mac App Store deal posts. The OS requirement in the title is the one listed on the developer's website, but you need the Mac App Store which requires 10.6.6 to get the deal.