I read through most of the post on ADV for the Shinko 705 and what Ive learned is the front 705 direction arrow for the tire is in the opposite direction from the rear so if I put a rear on the front I will run it in the opposite direction. Another thing mentioned on the ADV site was using the tube type tire in tubeless wheels and buying tubes. Are tubes needed if running tube type tires in a tubeless wheel? I didn't see that mentioned here on this thread.
JDROCKS among others recommend running the tire in the direction of the arrow, front or rear, as the grooves are oriented to disapate water as you roll forward. Mounting them in reverse could lead to hydroplaning in standing water at speed.
I'm no tire expert on construction, but my understanding is that a tubeless tire has a different bead, but I could be way off base. It has been generally accepted that you can put a tube in a tubeless tire, a tube in a tube-type tire, but not without a tube in a tube type tire. But yes, some have done it. The question then becomes, if the tire gets low on air will it break the bead in motion? Offroad tires on jeeps and four-by's will do that. Another consideration is that the maximum rim width for the 120/90 tire is 3", the versys front is 3.5. This will also increase the chance that the bead can pop, plus it further flattens out the profie of the tread when you pull the sides out. Is half an inch a big deal? I dunno, I'm just sayin' - these are all considerations and concerns.
A tube also creates and traps extra heat compared to a tubeless. Something to consider if you're going to run hard on a Versys. That's why they put Z-rated tires on them. Just something to watch out for.
Also, a tube-type tire has a different belt construction than a radial. And the generally have a stiffer sidewall and a less stiff tread, so the tire will roll over easier than a radial. Another thing to consider if you ride aggressively on the road.
My take for any of these substitute tires is to keep your speeds under 70 and go easy in the corners. There simply is no way they're going to grip on road like a sport-touring road tire of the proper size.
I would hate for someone to tread their bike with unknown or risky tire combos and then go out and slide their bike off the road, or worse, be injured in a crash. Again, I'm just sayin'. There is no way that this forum or any of its members can be responsible for what individuals decide to do with their bikes. Just a general disclaimer here.