Automatically capture all API exceptions when using Velocity scripts

Initially I thought this was a good idea. I made a proposal on this thread:
http://markmail.org/message/zxqkketfixqw7m63

However after thinking more and experimenting by starting to implement it, I've realized it wasn't such as good idea and I've proposed a counter proposal at:
http://markmail.org/message/e77r6zn45teghrmz

I'm just creating this issue to record that at some point we wanted to implement this and I'm attaching the code that I had created for posterity...