Thank you for putting up an SMV. Now I can see exactly what you're doing. I looked at it, and I like your idea, since it would allow us to get out of Fillmore one phase earlier, and leave with 114 people instead of 106 people like the other strategy for leaving Fillmore earlier.
There are just a few things I'm concerned about: how much time is used up moving the construction pointer? Whenever you move the construction pointer, the construction timer stops. I'll try to find out how many frames are spent moving the construction pointer in comparison with my strategy. It probably won't be a huge difference, and the fact that you skip that message about the rock will reduce the difference in timer stoppage, but it's worth a check.
Also, (and I don't think this is at all your fault) for some reason when this strategy is used Fillmore's first out-of-town construction phase occurs after two phases in Bloodpool instead of one like in my strategy. If you look at my population growth table for my second sim test, you'll see that Fillmore grows yet again on the same phase that the population of Bloodpool and Fillmore combined goes over 400. In my strategy, that second out-of-town growth in Fillmore isn't necessary to get out of Bloodpool by it's 8th phase (14th overall), but in your strategy it
is necessary in order to get out by Bloodpool's 8th phase (13th overall), because you leave Fillmore with less people. But in your strategy, Fillmore's second population increase in Bloodpool happens in Bloodpool's 9th phase, not it's 8th. So you end up having to wait one more period in Bloodpool, which cancels out leaving Fillmore one phase early. It's just that this time you leave Bloodpool with 16 more people, which according to my sim tests won't be enough to save construction phases anywhere else. Given that, I think which strategy we choose will probably depend on which one delays the timer less.
That reminds me that I forgot to put up my document listing memory locations (well, actually there's more than memory locations, but I haven't bothered to cleanly separate stuff). I'm really sorry that I didn't think to put it up earlier, because it could really come in handy while doing testing sim stuff, if you haven't already found the memory locations.
ActRaiser Memory Locations.
EDIT: If we're going to have a fair comparison of the two strategies, though, we'll need to make sure things like road placement are optimized. One thing that comes to mind for your strategy is that the road just to the left of the southern bat lair is not necessary, because Fillmore won't grow big enough to use that, judging by my sim tests.