Daz,
As for the merging lines of different nationality: Boundaries and other lines are usually black anyway. Enemy boundaries can be marked with a "ENY" without using colour. You can also mark nationality boundaries in a similar way. E.g. 1 (GRE) on the left and 2 (UK) on the right of a boundary. If this would be a Div Boundary, you would say that the first Division on the left is greek, and the second Division on the right is british. Then you draw the Divisions (or Bns, etc.) in their respective locations.
I honestly don't know what to do with the FLOT, since this is by definition biased. As long as we have a FLOT, we won't get to the desired neutrality. Then again, you don't need a FLOT in many situations. How about using an Line of Contact (LC) instead, or a FEBA? FLOTs are used to discribe a situation where the LC/LD or FEBA/PLs are not the same as the FLOT. e.g. when you want to show where your Security Zone ends. But i don't recall many scenarios where you would have units at scenario start lurking outside of your MBA (which is limited by the FEBA). battle handovers are another situation where you usually have a FLOT to indicate the forwardmost elements of the moving force, that are disengaging.
the point is: FLOTS are used when things are already moving. If not, they are usually the same as LC/LD or the FEBA. So the usage oft he FLOT should probably be limited to Screens, Guards etc. operationg forward of the FEBA or if you have to discribe a situation that has already transitioned into the "ongoing" operation, e.g. because scenario start is after the LD/LC has been crossed and your units have already pushed beyond....hence the FLOT.
Another thing about battlefield graphics: Only use as many as you need to, to discribe a given situation. If you don't need a symbol, something is too much and you would confuse others with that, or overload your map....shred it.
Regards,
A