I have come up with a few ideas to make the magnetizer block itself and the system of it more fun and easier to use. The first idea is to either let magnetizers affect posts next to them or reshape the magnetizer block itself so its flush with the fence, allowing for long continuous stretches that don't have a change over every 40 blocks. Another useful addition would be allowing a series of magnetizers be controlled easier from a single point, perhaps if the bottom one is activated/deactivated it sends a signal to all above.
An additional boon to the system would be a way to use the powered magnetizer to ascend without wearing metal boots, by maybe using a device somehow linked to the post. (tie a minecart around it?) Its just a real shame that the magnetizer requires you to wear a certian pair of boots from a very small list.
Lastly, if its not too crazy, some way to get limited horizontal movement from the magnetizer rail system. Perhaps using the minecart idea it would be possible to make a super high speed mag lev rail system (booster rails and furnace carts are so last century) to hurl someone down a long line and possibly catapult them through air. Like i said though, may be too crazy for albaka to even consider, despite how much fun it would be.