There is a way of marking questions that led to a new package. However, recently one of my own questions inspired me to create a program (written in Python) to help me manipulate tex-files. Is this something that we want to have a way of marking as well, or are these type of events too infrequent/not relevant?
I would consider this as a part of Mark questions that led to creating a new package.
The reason lies in the confusion by the word package -- on one hand, it means "a thing that has something to do with
\usepackage", on the other hand, it means "whatever is a package on CTAN or elsewhere". Your new Python program IMHO falls into the 2nd definition of a package.
It shall as well be listed in Which questions led to the creation of a new package?.