Honestly, I just add the additional seasons/chapters/parts as a separate action within one title.
That way it only takes up one slot and I only get one update notice. The latest.
View attachment 4646462
So you keep the root folder as the install directory (ex: DriveLetter\Porn\Games\) then you add and action for each executable folder and just add that folder to the file path:
{InstallDir}\Season 1\game.exe
{InstallDir}\Season 2\game.exe
{InstallDir}\Season 3\game.exe
This gives you the added benefit to track time played by the game instead of executable.
If you're bad at remembering what you finished, you can always change the action name to something like 'Season 1: Finished' or add that info in the notes section.
The actions section is also useful if your title has a pdf walkthrough or something else that can be run outside the normal game (which can be configured to not add to playtime.)
Not exactly an answer to your question, but perhaps a work around.