Really? Wow, that's kinda surprising, but yeah, that would be a great feature to implement if there's ever free development time.
In particular, it's a real problem for characters that use shields. With Valerie for instance, if you want to have her easily able to switch weapons, to mitigate DR for example, you can't do so without having more than one shield. Not only is that kinda a resource sink, it weighs heavily pretty literally in terms of encumbrance.
Would also be useful for switching between 1-handed and 2-handed wielding of a 1-handed weapon for a magus.
Currently, it's not terribly difficult to go into inventory and just switch the weapon in whatever set you have the shield on, or remove the shield in the latter case, but it would be nice to do so with the weapon sets, considering that they're there for convenience to begin with.
Thanks for reading!