You can pass the argument to ghc from ghc-mod as:
$ ghc-mod lint *.hs -g -dsuppress-module-prefixes
This will send the argument -dsuppress-module-prefixes to ghc.
Does GHC-mod have to use full names for types?
You can pass the argument to ghc from ghc-mod as:
$ ghc-mod lint *.hs -g -dsuppress-module-prefixes
This will send the argument -dsuppress-module-prefixes to ghc.