Hi Volker,
this is definetly something where we have to improve the tool support in eclipse. For defining the exception IDs via the constants we have included a static code templates that generates the structure of the constant for you in the editor. So you only have to fill the Message ID, number etc. But we want to improve that handling so that you have a similar wizard like in SE24 to create the exception IDs.
Next point is the re-generation of constructors. This will be provided via Quick Fix. We already have the Quick Fix for "Generating Constructor". Next will be 'Regenerate Constructor".
Will this help? Or do you see further improvements from your side?
Regards,
Thomas.