Leakage on shock absorbers means nothing. The question to ask is: Do the shocks work correctly? If the shocks don't work, it could cause handling problems.

Is that toe-in measurement within specification?

If your shock is leaking then it may not have any oil left in it, therefore no damping.
I would recommend replacing them anyway if they are leaking regardless of action, they have seen enough km's to not be at their best.

Live axles can be tweaked for camber/toe quit easily, even in the car. Just use a blowtorch and heat the housing tubes to cherry red on the side you want to "shrink", then quench with water soaked rags. Start off with a small patch and check the alignment after every adjustment.
Did this with an escort atlas housing to straighten it right up after copping a massive hit and bending pretty severely.

Most shocks with visible fluid leaks are pefectly fine...

You can test them easily enough. Just push down on the corner of the car and let go. It should bounce only 1.5 time. If it bounces two or three times, replace the shocks.

I have the same issue with my '80 210 wagon. I plan on getting some KYB gas shocks, and some wider tires and wheels. If that doesn't completely resolve the issue, I'll get a rear stabilizer bar.