[Orgmode] Feature idea: Automatic clocking

[PT]

I just started using clocking and it seems really useful. It
occured me it could also be done automatically for certain tasks
which are performed in the org buffer.

For example, I work on some text which I keep in an org subtree,
the branches of the subtree hold the chapters, etc.

If the main subtree which is the root of the document has a CLOCK
property (put there by a previous manual clocking) and also an
AUTOCLOCK or similar property then it could monitor if I modify
the text within the subtree and start the clock automatically. If
I stop modifying the subtree then after a while (say, 30 seconds,
configurable) it would stop the clock automatically.

So for subtrees explicitly marked for automatic clocking the user
wouldn't have to start/stop the clock manually at all, org could
do it itself.

What do you think?