We've all felt the frustration that follows launching from a station only to realize that you've forgotten to group up your weapons the way you like it. How about a set of slash commands to fix things on the go?

Or if there's some way that I'm woefully unaware of, please to inform.

As far as I know weapon groups can only be changed while docked at a station.

That is correct. I am in favour of adding the weapon group config screen to the PDA, though.