I can't tell from your description, is this an update to the mod, or just an update to the FGD based on features that are already in the mod?
An update to the fgd based on features already in the mod that were undiscovered. Forgive me if that was unclear.
It Is Only An Update
to the .fgd wouldn't it be better to upload just that?
What's the reason? Those three maps? Or were they already in previous Drake's dev kit?
In addition to the updated .fgd and expanded devkit.txt, this zip also includes e1m5drake, an add on to e1m5 by huanlopan demonstrating some of the unknown and undocumented features that the drake mod had.