Gosh, fellas, I'm touched.
(Apology in advance for going totally off-topic, at least in terms of the title of the original post...)
Peter, you can use native Capture effects to emulate stamps in Snagit. Let me give a specific example.
In Snagit, as I assume you know, one of the common sets of stamps is numbers in a circle, I think from 1 to 20. These are very helpful for adding to a screenshot in order to designate various areas of the shot; the Flare author can then use that image in a topic in which he/she includes a legend that explains what the numbered callouts mean. This is very common for images that appear in documentation that will be translated -- no need to translate the numbers.
Anyway, one can achieve something quite similar, even somewhat more easily, in Capture. The idea is to create an object, be it a rectangle, square, oval, or circle, that has the desired border, background color, and size. Furthermore, the object can have "rich text" associated with it. (Rich in the sense that the text can not only be present but can be formatted: bold, italic, whatever.) In my practice, I have a little square with a dark gray border and a medium yellow background, and its rich text reads simply "1".
Now comes the magic. Capture has a concept called a palette. It comes stocked with a whole bunch of objects, including, in my opinion, some pretty awful looking arrows. I don't use any of those things, or perhaps rarely so. But I do use the palette. Back to that little "1" square, I right-click and say (I'm going on memory), put this on the palette so I can now use it over and over. But do I really want a bunch of little "1" squares? Of course not, but I can easily change each object's rich text to be 2, 3, 4, etc. In short, I don't need a whole collection of stamps from 1 to 20. I just need that one 1 on my palette. When I need a numbered callout, I drag that one 1 off the palette, position it where needed, open its properties, and on the Rich Text tab, change 1 to whatever number I need.
Another advantage of Capture's palettes (yes, one can have multiple, differently named palettes) is that I can share a palette with another author.
If you haven't yet done so, go to MadCap's recorded webinars and watch any of the Capture webinars presented by Paul Pehrson. He is a *master* at Capture. I'm just a lowly hack. I guarantee that you will learn a lot from him.
Sidebar: If you're interested, I wrote a blog post a year or so ago about an experiment I did in Capture to emulate some other Snagit effects. The link to my website is in my signature; then just go to the Blog page (for all of about 3 or 4 articles! I don't blog often).