In my opinion the syncro's do drive better than 2wd, the suspension is slightly firmer, much better for taking road humps at speed etc. Much better on the twisties, and the saftey advantage of 4wd.
The choice of aftermarket springs is worse than for the 2wd. The most thought out seems to be from go-westy in america, but the springs are H+R from germany.
http://www.gowesty.com/
I often drool over their parts and attitude.
Some have talked about lowering syncros, as they are noticably higher than a 2wd, if you did, you would have your stealth syncro, except for the fuel filler being at the back.
Standard these vehicles are very competent, there is no need to modify. (Unless you want to)
I have a de-coupler and often try to see how far I can get up a lane in 2wd, and if it is dry, and the rear wheels stay on the ground then you have a fighting chance.
Mine is a full camper, and very heavy, this improves the suspension as the weight compresses the suspension much more off road, improving tyre contact and grip.
I like camping in the woods, a syncro is just so perfect for that, there really is no other vehicle that does this so well.