Guild Wars 2

I haven’t seen this anywhere on the forums, so correct me if this has been noted before.

I would like the ability to switch which skills I have on my bar even when the skill in the slot I want to change is on cooldown. I ’m not asking for the cooldown to be removed, of course, and only while not in combat.

For example:
I am an engineer that mostly runs an elixer build, but sometimes I like to play around with the turrets. The problem is I am generally waiting for the really long cooldown of the turrets to finish before I can switch back to the skills I normally use. Often I find myself in combat before I can switch and then stuck with the turrets I no longer want to use.
Is there some way we could keep the cooldown but change which skill is in that slot without causing any problems? Like if I was to use the turret then when done with it and before the next fight pick something else for that slot while the cooldown continues so that I will have the right spell in there when I need it later.

side note: how are the words “and” & “thus” when put together filtered?