I believe this might be true, but GOG probably goes another route: my patches or in case it happens The Dark Mod are counted as "mods" for games, Bloodlines and Doom 3 respectively, for which GOG already has the distribution rights.
Hm, maybe I should add the readables and tools to my patch as well. It's all about more realism anyway and I don't believe you can ever drop an item by accident, so it's the player's own fault if they mess their game up.
If you don't want to use my patch just to get this, PM me and I can explain what file you need. Also it would be very easy to make all player tools droppable as well, but I don't really see any sense in that!
Again I suggest that once this is stable and has been tested, the integration into the core game should be contemplated as this is a much too fundamental improvement to just be available as a mod! Also you should contact the creators of the Volta missions to a) check if they didn't just fix similar things to what you did and would be willing to remove their work and b) if they even permit changing their missions as I know from my own experience that some mod author's don't ;).