Hi @Jab7865 The S pen already has a number of features and as @Glenntech has indicated the ones you have suggested are not that practical and in my view would not really come out favourably in a cost benefit analysis. However we do like to have an exchange of ideas on the community. I'm taking it you still have the Note 20, anyway I am going to share a few articles. A review of the S Pen features on the S22 Ultra https://www.xda-developers.com/samsung-galaxy-s22-ultra-s-pen-features/
A look at the S Pen Pro https://www.xda-developers.com/samsung-s-pen-pro/
I do not work for Samsung or make Samsung Products but provide independent advice and valuable contributions.
My Device- S21 Ultra 5G ( SM-998B/DS ) CSC= BTU , 12GB/256GB
One Ui 5.0,Android 13 .