The template I used is

  (?f "* %^{Paste the link}%?\n\n%:region")

The bookmarklet:

  javascript:location.href='remember://' + location.href + '%1C' + \
    escape(document.title) + '%1C' + escape(window.getSelection())

This basically add a :region property to the link created by the
bookmarklet, :region containing data from window.getSelection()

> I don't know whether others will use this functionality.

Would be nice to know... I didn't use it a lot myself for now;  I can
put the file somewhere on the web if needed.

-- 
Bastien