If I had Peter's powers, I'd go to comic cons and get the big-wig creators who have sticks up their butts to, well, remove them. Everyone would write comics that they wanted to write and, if they didn't want to write the book, they would step down. I'd also make it so that comic company executives think that comics should be 22 pages for $2.99 with variants only for special issues, like issue 1's, 25's, 50's, etc. Also, ALL books would go back to original numbering.
Lastly, I'd unlock the potential in the brain of Peter David to fix any damage the stroke may have caused.