TOPIC:

Hello, we recently bought a license of your product. And we are trying to figure out is it possible to select drawing pen by clicking on editable field with specific name.
i.e selecting the drawing pen automatically when the field with specific name is being clicked (like signature field)

Using the latest verion there is the handling of graphical (not-graphometric and not-certified) signature for sign form fields.
Note: the added signature might not be rendered using other readers like (Acrobat desktop version) as it's handled via setIcon to disable this feature modify Global.sEnableGraphicalSignature.
It can be rendered correctly using: Xodo(PDF tron), Foxit, MuPDF, Acrobat Andrid app

Did you check this version?