The ForTwo with non power steering isn't really that bad...for a man. A bit of an efffort
for a woman, just. And it's only 'heavy' at very slow speed...as in parking at 5mph... or less.
In my experiences of working on ForTwo's, and one's I have seen being serviced at S2
I can guarantee that nearly every one has had the wrong front tyre pressures ! Typically 24psi.
They should be 30psi all round, which then makes the steering a lot lighter.
And if oversized (as in profile) tyres are fitted then the steering is bound to be heavier.
S2's courtesy 450 doesn't have power steering, but it does have Michelin front tyres, and
with those it feels exactly like my Brab 450 with power steering and wide low profile tyres !
So the simple answer is...keep the tyre pressure right, don't park at too slow a speed,
and if possible...fit Michelin tyres on the front !
If you want the expensive / other option of having power steering fitted, then why not
give S2smarts a call....or your local Smart independant as the labour costs are far cheaper
than those of MB.