Advice for a new smoker

Hello, I've started to smoke, and I have a couple of questions.

I'm smoking on FreeBSD 4.8-{RELEASE,STABLE}. configsmoke.pl says that 
-Duselongdouble and -Dusemorebits do not apply to my platform. Fair 
enough. As it is, the run with useithreads, useperlio and use64bitint 
took just over 2 hours.

I could let this machine smoke for up to 16 hours a day, so I was 
wondering whether it's worth testing other combinations, usemymalloc 
comes to mind. What would be the most useful combinations?

I also plan on smoking 5.6.2 and 5.10. When I ran configsmoke.pl to 
prepare for 5.6.x it suggested that I rsync from

ftp.linux.activestate.com::perl-5.8.x
                                 ^^^^^

Is this right? Or should I y/8/6/ in the above? Or fetch from 
somewhere else? Do European mirrors exist?

Thanks,
David