Andrew, it is possible to tack my 4-masted barque by simultaneously swinging the square yards, as you propose to do with your brig. However, it is not the way the real ships tacked. Nor is this method as forgiving of skipper error or subtle windshifts that might occur during the tacking maneuver.
Wearing my barque is impossible w/o separate controls of the yards on either side of the CLR. I must tightly brace the fore, and shiver the main and mizzen squares (which also sheets out the spanker), to get the bow to fall off. Moreover, in a high wind, wearing is impossible unless I strike all sails on the jigger mast before setting out, a sort of extreme example of differential bracing
.
If possible, I'd rig your brig using the 2 winches to separately control the square sails on fore and main. The fore&aft sails' sheets are not that important to tacking. Tight jibs, staysails, and driver will not hurt you when you turn into the wind for the tack.
Again, wearing, and possibly broad reaching, is another story- the f&a sails will affect those maneuvers, and sheeting out the driver when you want to bear off is probably required. I can envision a line running from the crojack to handle the driver's needs, and you could do the same off the fore course yard for the jibs (treat the yards like a sail arm servo).
Several maneuvers in the real ships took advantage of the ability to swing masts separately. I have a lot of fun attempting those maneuvers.
The barque thread:
http://www.rcgroups.com/forums/showthread.php?t=743611