Hi, this works for me, thanks. Just to offer some feedback though, it would be great to make the default select option something generic, like 'Please select' rather than 'Select Post' as it currently is.
As this works with custom post types, which can be used for basically anything from vacancies to products, something like 'Please select' would work better - the end-user doesn't know the data type is a post, so it would look confusing when having say a list of products, for the default to be 'Select Post'. Even better would be to allow the admin to edit the value from the widget config screen so they can set e.g. 'Select Product' or 'Select Vacancy' etc.
I had to edit the plugin to change this, which I never like to do, but apart from that niggle it works great, thanks again.