This is not a gaming suggest but more about modding the game in a clean, "plugIn"-alike manner.
I've not found a versions-info anywhere in the main.pak - i hope i did not oversee it.
It were very helpful if the main.pak would contain a small (text-)file containing the games version-number this main.pak belongs to.
Currently modders mostly supply the whole modified main.pak that has to be renewed with each new version when the game updates.
If they would instead only have to supply the data to exchange, it were possible to use a mod on a new version of the game - even if it's author has not made a new version of it yet.
Also it would allow to use multiple mods at once.
Such small textfile as "Version.txt"
containing only something alike
1.0.013
inside the main.pak would be great help to keep overview about the main.pak's on the system, also in backing them up etc.
It should not be game-relevant file - just informative, so i might make my editor to append something to the file as adding included modifications name on a new line.