[Inkscape-user] Writing an extension for a new object type

Hi,

I see that one can write so called "effect" extensions which are available through the effects menu. But is it also possible to write an extension that allows the creation of a new object type at a position where the user clicks?

For example, an extension that allows me to click on a new button in the tools menu. When I then click somewhere in the image, a script is run which creates a predefined object at the clicked position.

Thanks! Nathan