Importing/exporting of mod lists
I've found myself wanting to share mod lists a few times, but (as far as I know) this currently requires either creating a shell script to run a series of Portmod commands (not very cross-platform portable, and tedious) or creating a metapackage (not beginner friendly, and time consuming.)
I was thinking it would be cool if Portmod could generate a file with the list of the all the installed packages (excluding system packages), and their selected use flags. Then for somebody on the import side, Portmod could just go through the file line-by-line to install each package with the right use flag.