Allow disabling ShareThis per node

I love the way module works from the box. It's easy and very flexiable. Though I usually need one more feature this module still doesn't have.

Lets say I have a list of pages with an enabled ShareThis widget and one of these pages is frontpage which I'd like to don't have ShareThis widget exposed with no coding.

Attached patched solves this issue, though it needs review by community. What it does is adding new checkbox to configuration page called "Allow to disable", which makes it possible to disable widget on certain nodes by setting newly created checkbox field to on option.