Simple...I think one should consider the balance between the cost/hassle for the devoted volunteers that have done this, and the potential issues that may arise from having, maybe, someone skew their rating temporarily by playing a lot of ASLSK against less experienced opponents. I just cannot see this being worth the time and effort.
Create another sheet on your EXCEL spreadsheet.
SK games only.
Not rocket science..
I've created my own and I am hardly as skilled as Doug and others.