A potential submodule could be Foo::Bar::GIS for exchanging data or even interfacing with other geo info systems, such as ArcInfo or GRASS. It would be nice to get spatial statistics from other specialized software rather than, say, implementing your own variogram
in Perl. (Well, one (useless) use of this could be to see if the XP of monks have to do with where they live, since we already have XP and location stats for many monks--but of course you could as well more qualitatively spot the pattern by staring at a map... or you could use it in epidemiology.)
It could be a bummer if you could group data by nice geographical name but were unable to easily compute certain statistics (which could happen to a general-purpose language); or you could compute statistics grouped by zip code but were unable to more easily convert all the zip codes to more human-friendly regional names (which could happen to a statistical software).