Maybe something which has never being made for an h&s, and it is needed for hybrid toons:

At first I had mad a character who was supposed to fight both with crossbow and dualwield blades,
but I was fed up switching, moreover that it was not an easy build to keep it competitive.

But, at least, please devs add an autoswitch, it should work like that:
The autoswitching would be an option which switch for the distance of monster attacked.
It should have two values, one for each set of weapon:
. if I'm using close weapon: if I don't want to run too far, it switches to ranged weapons (I can decide to run a bit instead of taking crossbow).
. if I'm using range weapon: if the target is about to be in close range of my other weapon, it switches.

Not a big pb: then the distance for switching is to be changed:
To switch to a close weapon, we must not wait being close with range weapon, so the distance of switching will be farther than with immediate switch.
To switch to a range weapon, I think it doesn't change the decided distance. So, here is work for the devs.

No, devs want it to be that auras/buffs disappear when you swtich stuff around. It used to be the case that they wouldn't disappear if you switched, but they deliberately changed it so now they do.