AWD does cost some horse power, but it's more effective at getting it to the ground.
Take the Mazda 323GT vs GTX (FWD vs AWD) for example.
The GT is a tad faster on smooth roads in a straight line. But rougher road, or cornering the GTX will slaughter it.
It's hard to say...depends on the road and conditions to. AWD can be faster or slower. It does cost some HP, but is more effective at getting the horses it has to the ground.
Really a 1.6L is never going to give you any torque...
A supercharger usually helps in low end, but on an engine that small the blower would pull too much power off the crank and kill your low end.
For the record:
Supercharger (aka blower) is a belt driven forced air unit, and thus pulls a little power off the crank.
Turbocharger is an exhuast driven forced air unit, and thus doesn't pull any HP off the crank, but needs some RPM to give any boost.
The top end of a Turbocharger is higher, but a Supercharger starts giving boost at 1RPM. So you give up your high end for better low end.
The problem is, a 1.6L engine has so little power to begin with at the low end that you'd need a TINY blower or it would suck all your power. And a blower that small just wouldn't help much.
Those tiny engines need to rev way out to get power (which is why they work very nicely turboed). It's really really hard to get low end power from them.
Also, add to the fact that it's a FWD car, when you launch your moment intertia pulls back and you lose traction on the front wheels.
It's very hard to get low end power from a small engine, and it's very hard to get a good launch out of a FWD car. Neither are "impossible" but quite difficult.
Some better gearing should help, but it's not going to make it huge.