Surely the rack will help on center feel and steering precision just off center.
You're out of luck on the beam, though, Stan. The beam can be made to work reasonably well, but it has a major design limitation that cannot be overcome sufficiently to rival a double A-arm design. To wit, the camber of the wheel on a beam front end remains constant to the car throughout the travel of the suspension. That would be fine if the car was parallel with the road at all times, but it isn't. The car rolls around its roll center during cornering (we won't even get into roll center issues). That means that if you had set -1.5 degrees of camber, and the car rolled 5 degrees in a corner, the outside front tire is now at +3.5 degrees camber. The only way to avoid this is to avoid body roll by stiffening the ride and anti roll bar rates. That solution has its obvious limits. Caster can also effect camber as the wheel is steered, but nothing like the amount needed to compensate for body roll.
The double A-arm system has a camber increase relative to the car built into the travel which keeps the camber of the tire relative to the road constant as the suspension compresses (or increases it, or does whatever the designer has in mind within the limits of packaging and geometry).