I was driving home from class (College Math) earlier today, and started thinking about some of the applications of electricity and electromagnetism. And I got to thinking of what could happen if a lightning element user like Makoto ended up with an Applied Science degree in electrical engineering and possibly a background in the related nuclear physics.
When I started stringing the related theory behind different tiers of electrico-magnetism together, I ended up with quite a wicked little cluster of abilities should 'could' produce simply by fine tuning her ability to manipulate electricity.
Here's a chart.
Mind you, the chart is neither exhaustive, nor does it go into exactly WHAT is required, but just touches on the concepts available to her just by layering additional knowlege sets on top of her basic skills.
Quite frankly, when I essentially worked my way to 'fusion cannon' after only starting with 'lightning bolt', I started laughing.