Hey Chroma:
I've been reading and considering.  We, the FERC and the Taccomms development, actually have a lot of very similar ideas implemented in different fashion.
Starting with our special rules...
Swarms:  I like the flexible swarm system and the synapse range.  I realize it's occasionally problematic but it's also a strong flavor element.
Relentless:  I think this should be kept.  It's similar in game effect to the FERC Synapse rules with respect to keeping formations moving.
Expendable:  Your comments about the "token" BM were something I hadn't considered.  Perhaps the French "coming under fire" option is better in that respect.
Spawning:  I think this can go.
Flame Template:  Out.
From the French...
Unstoppable:  I have no issues with this for movement, though impassable should remain impassable.  I'm not sure about the restricted withdrawal move.  It could make swarms very vulnerable once they break and I'm not sure what it's supposed to add flavor-wise.
Synapse:  This is much simpler than synapse range as far as the number of words required to explain it, but in-game I would not expect it to be any easier.  Tracking different Initiative ratings as they change doesn't seem any less fiddly than checking range from Synapse.  Different objective claiming rules is of comparable complexity in both lists.
Supreme Commander:  This seems to be entirely for their BTS goal.  It's a workable option but I prefer ours.  Besides, their list could technically be fielded without a single Synapse Creature (like an Ork list without Nobz).  I'd generally avoid "if-then" rules based on force composition.
Meiotic Spores:  With their "spore chimney" as the on-board source of AA like Lionel proposed this is very much like the spore cloud system.  The difference is the AA range and the AA model stats.
Regeneration:  Absolutely not.  Way too much luck involved and feels terribly unfair to anyone not able to crush a WE in one turn.
Mycetic Spores:  I'm still a bit fuzzy on the FERC intent, so I'll withhold comment except to say that stylistically I'd like to see this as a feature of a theoretical future "Phase III" list.
Tunneler:  I like the idea of a Tunneler mechanic, but in our list the issue preventing its use is the synapse control - none of the tunnelers can bring in their own synapse.  There are a number of potential work-arounds for that, but I think it deserves a separate discussion.  There are too many things that its dependent on.
Units:
In general, the French units tend to be more shooty and more "bugzilla" in terms of power-per-unit.  I'd approach this with a large amount of care.
LV Synapse:  This is workable if you cut the synapse range/going to ground mechanic and/or if you allow more synapse  per swarm but otherwise it's a problem.  Options to "stack" synapse creatures and build groups could mitigate that somewhat.  Also, the question of unit type consistency with other similar size/genus needs to be addressed.
Zoa:  Based on 40K, I think this needs to be a Synapse Creature.  This might provide a potential middle ground between the people that would like to be able to build synapse groups and those that want them fixed.  The groups are fixed except for the option of adding Zoanthropes.
List structure:
The French system has some strengths.  The representation of Warriors as the near omnipresent tool of the hive mind is kind of neat once I got to looking at it.  It never hurts to put all those Nid Warrior models everyone has sitting around to work, either.
If the Swarm system is to be dumped, though, the Ork structure needs some tweaks.
First, there needs to be a horde discount, imho.  Otherwise, there is very little incentive to take larger swarms.  A popcorn list might not be a problem with respect to balance, but it is with respect to flavor.  Smaller swarms result in a more tactically flexible army, especially since you can easily have 2-3 BM-placing units in each.  Larger swarms need to be incentivized in some way.
Second, there should be some sort of division of common swarms and support swarms.  As the French list stands, it could be fielded without a single Synapse Creature and/or it could be fielded with a majority of elite units.  It might be that those uncharacteristic builds aren't really viable anyway but they should be restricted for flavor reasons.
All that said, I'd still rather look at ways to work with the Swarm system that could incorporate some of the benefits of the Ork template.
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Edit: Doh!

I just downloaded the last FERC revision and noticed Big/Uge discounts had been incorporated.