I run my welded rear on the road, rarely. I know of people who daily drive their cruisers on the road with welded rears. IMO,if you apply ANY power in a turn, the rear locker should engage, and it will act like it's welded anyways. On the highway, you'll get that "locker kick" where it coasts for a sec, then locks, then "bumps" you about 6" to one side...strange at first but very driveable once yer used to it.
You don't get that with a welded rear.
IMO, the tires "bump" thru turns regardless of locked, limited slip, or welded. I hate rear lockrites, they require too much "lash" to kick in-out on a daily driver. Full awn rear detroit is much tighter and more driveable, IMO, but for the $500 for that you may as well weld it up.
I don't think I answered your question....heh.  

o you have any cruiser buddies whos rigs you can drive with a locker to see how it handles on the street? Unfortunately, the driveability of a locker/LS/welded is as much driver opinion as anything....
That said, I ran a locker in the rear of my pickup for 7 days and switched it for a TrueTrac....daily driving it sucked. Made for an expensive week....