I would like to have no weapons selected sometimes.
(Peaceful trader valuing RP'ing over fighting)
I've set weapon groups 1,3 and 6 to be empty and 2,4 and 7 to be armed.

I can arm them by pressing the appropriate buttons for 2,4 and 7, but not disarm them by pressing for groups 1,3 and 6.
(I don't use group 5 at all)

Is this a bug where I can't select empty groups or a feature that prevents me from being defenseless even if I want to be?

I think that it disables any weapon group without weapons in it. not sure why this is, probably as a "feature" to keep people from accidentally turning off their weapons by hitting a nonactive weapon group. the strafe keys are over on that corner of the keyboard and it's real easy to accidentally hit a 2 or 3 when trying to roll right + strafe up. as it is only use weapon group 1 and 3 because otherwise i always end up switching weapons without intending to midbattle.

That's a pretty cool idea though. Like a little safety mode thing so you don't accidentally shoot... well, when friendly fire is turned off... *sigh* nevermind.

That's noble, but with the recent rise in pirating, I'd advise your Role-Playing self to keep your finger on the trigger. It would be cool to have a safety, though. Sometimes I like to watch duels, and I'm always scared I'll accidentally interfere.

Ya I asked for that 'feature' to be removed a while back in susggestoins.