Nope, that's it. Pretty much standard VMS conventions -- unless you explicitly ask for something other than the highest version, that's what you get. If you want something else, then you have to ask for it.

There's XS required no matter what you do, though generally it's hidden. (The code to do a lot of the VMS specific stuff is XS, buried in vms/vms.c) You should be fine with what builds by default with perl on VMS, though.