This feature is included in All Editions of Silhouette Studio
Silhouette Studio can be controlled with the use of a drawing tablet and stylus (such as a Wacom tablet).
A drawing tablet can be used by plugging the tablet to your computer, and then opening the Silhouette Studio program. From there, you can use the tablet in a similar fashion you would otherwise use a mouse tool. If you select the "Draw Freehand" tool, this will allow you to draw using the tablet device directly.
Silhouette cannot support or guarantee connectivity/compatibility of Silhouette Studio with any specific drawing tablet.