A client of mine is a longtime user of Snagit and they are enthusiastic about the many ways images can be enhanced and annotated, for example using running numbers.
However, they'd also really like to be able to define and use shapes with different textures and patterns. Among other things they use this for is to indicate problem zones on floor plans as shown in the example below (in Norwegian).
They're now using CorelDraw to achieve this. This is of course an advanced tool but also expensive and with a much higher learning curve.
I think adding this functionality would be a real improvement of Snagit and likely useful for many types of user.