Last year Simms was allowed to flank march his warhound out of the lava. I'm torn between the whole super heavy starting on the board. I mean it makes sense that these game altering units would be there at the start since they are the most powerful units for some armies. But then the argument of the battle not ending on the board edge but rather spanning the planet comes into play. Like the titan or baneblade the flank marches just got done ripping apart an enemy flank and is now joining this fight to boost this front.
I personally have severe suspension of disbelief problems with an major engagement happening without any attempt to secure the rear area. How is it that something as large as a super-heavy or titan is able to sneak up on an army's rear without being noticed and targeted?
I've some suggestions for compromises, though it is a little late in the game to come to agreement.
I'd suggest allowing anyone to flank march, but not to rear march. Both the river and the chaos rear might be secure, but the flank table edges would be open game for flank march.
It might also be proper to allow units with infiltrate or scout special rules to come in from the rear.
I'd note that Chimera are amphibious, while Deep Dive Marine's fluff says he comes from a water world, and normally fights under water. It might be amusing to allow a few Imperial units with the right fluff and equipment able to roll out of the river.
I'd also be disappointed if all objectives are in no man's land. I prefer a shooting style, and am often discouraged trying to play in store whose style is driven towards assault. A scenario where everywhere on the board we have assaults starting on turn one would be disappointing. All this room, and were going into a scrum right off the bat? Could we consider at least a few objectives where the assault guys have to worry about getting shot at before they are engaged? I like the idea of big tables where the speed and range of the Eldar might possibly come into play as part of a maneuver battle. If what we get is objectives centered in a 12 inch wide no man's land, things might turn rapidly into a rugby scrum. Sure, I can bring all my wraith lords and wade in, but there ought to be more to the game than that.