I think the easiest way here will be to break the spline into two parts, one for each team. You're right that at present there isn't a way to easily control items distributed in Tree Editor mode using areas or maps. We are looking to revamp this part of the plugin in forthcoming versions so we'll certainly consider this kind of feature in the new design.
You could also manually select and change items in tree editor mode in case you wanted to gain more control over the distribution and add the odd "rogue" supporter!
Also if i want to use more than 10 variation of the forest color as im using a lot of variation maps for the cloth can i include more forest color maps inside each forest color map to addd more than 10 variation maps usage etc..... Also if i plugged the same forest color in bump reflection etc... will it follow the same pattern of randomization?
You can nest Forest Colour objects but only if they are set to Element
mode. The same map index will be used for each Forest Color map whichever slot it's in so you shouldn't have any problems there.
Thanks for the kind words, I look forward to seeing how you get on. It sounds like an interesting challenge.
Please let me know if you have any further questions.