I don't do T+E but yes always arrange the cables in the right orientation if possible to reduce twists and crossovers behind a fitting. Also if possible choose the best entry point(s) to make the cables sweep round smoothly, so that you can leave as large a service loop as possible without making it cramped or difficult to push the fitting home. With a standard 2G box you can often get 8-10" of spare length in neatly, so that new fittings with opposite terminal layouts can be fitted many times before the cables are too short.
On the same lines, when making cables with round-bodied connectors such as CEE17s, make sure to put the plug / socket on the right end of the cable, so that the cores follow around the body in the same order as the pins. With a 13A plug, if you point the L core into its terminal, depending on which end of the lay you have either the E or N will lie on top of the other as they head to the left. Wire the bottom one first and it's neat either way. But with a 5-pin 63A on H07 it doesn't look right when they're crossed. Of course, if someone did the other end of the cable, usually a distro where it makes no difference, you invariably end up with the wrong end of the cable for your plug layout.
This all becomes much more important where there are more cores and less space, and the best example I can think of is the Socapex 19-pin connector that is one of the standards in performance lighting. This is normally used with 18 core 2.5 mm² or 1.5mm² flex, giving six independent 10A or 16A circuits each with a CPC (the CPCs are usually commoned together though).
There is a standard pinout and in YY a standard core numbering and you will see below that the two go together perfectly if you have the right end of the cable. If you get lumbered with the wrong end, lots of pairs and groups of cores have to cross over. The pinout puts L-N pairs around the outer ring and E's in the inner ring forming triangles with their L & N, ensuring that the loaded conductors are all on the outer layer of the cable for best heat dissipation, and two L pins are never next to each other to maximise creepage distance in the connector in case there's 400V between them.
You'll spot that the solder bucket connections are all sleeved because insulation between cores has to be impeccable in a Socapex cable. Both fan-in and fan-out 'spider' cables are used to individual 3-pin plugs and sockets, so you can touch the pins of say channel 1's plug, while channel 2 is plugged in and live. You can also see that for the straight layout I've made the L & N cores approach the connector 90° round from their pin positions, to make that gentle curved approach that takes up any minimal differences in length so that when the plug body goes on and the clamp is tightened, nothing can be under tension. The CPCs do similar in the opposite direction - there will always be a random relationship between the positions of the two layers in the cable, I try to give them equal amounts of slack before they meet up at the terminals.
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I would definately think about doing this.
