Keeping "traingulated 3-somes distances from each other" is one of the purposes I use for the range tokens.
Everyone is jumped by critter - all engaged.
Someone backs off to close, close marker between minis/standups.
Someone else back off ot close, joining first? engaged with them, they say "no I move in other direction", okay close marker to engagement, medium marker to the other character.
I also use them as randomizers at times (for more impromptu encounters) - put a close, medium, long in my hand face down - player pick one, Ta dah - that's how far away the foes are you just spotted.
I feel this is the "right" way to use the range system as per the RAW. Remember, WFRP is all about narrative. What is the length of the third side of a triangle? Whatever feels right considering how you visualize the scene in your head, narratively.
Just wing it, basically. After a few games, players will get used to your style and will very easily predict distances just by looking at the standups/minis and range tokens.
WFRP is designed as a game that uses intuition and gut feeling over logic and reasoning. As some players of RPGs are of the more logic minded type, it needs a while to get used to. (I'm one of those, by the way). But once you have the hang of it, it makes things so simple and flowing. It is definitely worth the effort. Some mathematical discrepancies might occur once in a while, but since everyone is immersed in the story, no one notices or cares!
Just like in the movies, actually. Movies contract and expand time and space continually through editing and lenses. Do you mind when the film is good? Not really.
In RPGs it is different, because PCs need to be able to predict how much effort they or the enemy will have to put in to engage, but you just need to make it FEEL right, not to have mathematical precision, and everyone will be happy. It works very well at my table, at least.
Also, remember that when action takes place in cities or other cramped environments, it's even easier. You can just say : anyone in the tavern is at close range of each other, to move to the next floor or in the street is Medium, getting to the next crossroads on either side is Long. Or somesuch.