While i dont use dosbox often i still use from time-to-time even though i not a doom veteran. The thing i use besides doomkids wad pack is novert. It simply removes the annoying mouse acceleration. Installation is simple. download it, put it in your vanilla doom/doom2 directory and when you lauch dosbox and mounted the directory simply type "novert" and it shall work.
https://www.doomworld.com/idgames/utils/misc/novert