Allow syschan use and extend ping

Allow a developer to use the sys channel if they're also an admin.  Probably not a good idea to expose it wider than that just yet.

Also increase the default ping length.  Most people who have been around a while have a longer ping.  Most people who haven't been around a while complain of ping related issues, so a longer default ping is probably wise.  I'm still not sure it's long enough, really.