I'd like to get a change in that, too. It is really annoying. You can use 'alt gr' (+7, 8, 9, 0) instead of 'alt'+'ctrl' but it is doing the same thing. It can already happen with lower values than 7 if you type a number between two brackets (as in arrays) quickly and the button is still pressed when you hit the number. So you are forced to type slowly to avoid that or you jump to a different tab and mess everything up. In addition, when you press 'alt gr', the arrow key won't work anymore to move in the code, because they only change the options on top which is pretty annoying too. And when already talking about things which need improvement... the codes in 'code' tags here in the discussions can't be copied properly with the Edge browser. The " " at the start of (almost) each line are not " " but "illegal character: '\u00a0'" which looks like an empty space, but is not. The workaround is to use a different browser (like IE for example) or click on "Quote" and take the code there but that could be improved. But the key binding thing is the main problem about the program right now and people with German keyboards demand a change...

We saw the same issue in BlueJ, so the issue is now fixed ready for the next release. Unfortunately, there's a chunk of other work we need to do to Greenfoot before we are ready for the next release, so it will not be too soon (very rough estimate: early next year). Apologies to the people with German keyboards in the mean time!