No this is not currently available and not currently planned, for our PDFViewCtrl WinForms class. There are though built in controls for deleting, rotating, inserting and cropping pages.
For our WinForms PDFViewCtrl class you would have to add this new Control effectively outside of PDFViewCtrl class.
For our newer PDFViewWPF WPF viewer, all the UI/UX code is provided with the SDK, so that would be easier to implement such a control, since you could utilize more code written by PDFTron.
Most development now is on our UWP SDK, which is making transition to WinUI 3.
What exact framework+OS+ui are you targeting?