Hi, nice extensions but you should keep in mind that you have used unpublished API's. Means the extension can be broken with the next version. I would recommend that you define a max version dependency in your description.xml and check your code with future versions. If it works change the max version of your extension and maybe increase the micro number of your extension to trigger potential updates. If it doesn't work, change the code, increase the max version and of course increase the version number of your extension to trigger the automatic update.
It's always tricky to use unpublished API's and it requires some more maintenance work ;-)

And a further nice feature would be to make the watch list persistent. I first idea that comes into my mind, is store to it as custom property in the document properties. This should be straight forward and loading and storing is done automatically. Ok it would be visible in the Document Properties dialog as well but maybe a better solution can be found later. Meta data can be an option maybe in the future, i don't know exactly at the moment. I am just thinking ...

Very helpful extension.

Do you think about adding:
- changing a cell value via WW
- moving an entry up and down in WW

PS
I see that grid control works now. I tried it in 3.2.1 version (in basic macro) and it notorious crashes whole OOo. (I made list-boxes to keep data.)