Zandronum

When editing my maps in Doombuilder 2, I occasionally make the mistake of trying to exit the 3D mode by pressing F10 and Y as if I was exiting the game, instead of pressing W. Because F10 opens up the scripting window, most of my maps have a SCRIPTS lump that consists of 1-4 letter Ys, and a 0, 16, or 24 byte BEHAVIOR lump. It's a good thing that I make frequent back-ups of my wad because when I delete those lumps in Slade, it breaks the maps.

How can I get rid of those lumps, or are they harmless enough to just ignore?

replace them with blanks

A BEHAVIOR lump is absolutely necessary if it's a Hexen format map. It's not necessary for UDMF format however.

Oh, yeah. I should have said what format the maps are. As you surmised, they are Doom in Hexen format.
So, can the SCRIPTS lumps be deleted safely?