I'll second Peter's comment,
A quick win for fixed spool casting distance is the reduction of line diameter, as has been observed since the introduction of 0.25mm for the 100 gram lead. I would like to see the downsizing of running line diameters continue across all leads, and as braided line is becoming more popular there is a strong argument to reducing line diameters, Although braid itself may not be suitable on the field for various reasons. I would allow the use of thinner monofilament lines, but also allow the choice of using larger diameters if the caster wanted, that way your not forcing people to use thinner line if they don't want to.
Any means of handy-capping based on a head start whether that's moving up the court or adding an adjustment afterwards would not work. Ultimately the two types of reel should not compete against each other and should be considered different classes. It's a bit like a motor race between a G-Wiz and a Porsche 911. The Porsche would win the petrol driven race but the G-wiz would win the electric driven race.