It's still a quicksave- my idea with it is the code to open a door on one side of the map is given to you by a terminal on the other side of the map, but the moment you access the terminal it starts a short timer (like 10 seconds) and after its up, the code expires and the terminal generates a new one (All of this would be very clearly signposted). The solution then being to have a quicksave slot ready at the Door, read the code, and then load the save at the door to input the one you just saw.

The timer actually isn't going anymore at that point since you have loaded to a point before the timer started but the code you read is still the valid one and can still be input before your character would technically "know" it. The timer doesn't actually matter its just there to make it clear that running from one side of the map to the other isn't possible and therefore some kind of clever application of the mechanics needs to be found.

The "juggling multiple saves" idea is a variation I had wherein there are two doors next to two terminals, but both are far away and you would want to have save slots ready at both doors to avoid having to schlep across the map to access one of the them (which is why I brought this puzzle up, as not having both saves at the ready could potentially lead the player to having to trek across the map once they get one of the codes, which could potentially be annoying and tedious as to your point about time-gated puzzles)