I know of no motor, electric or otherwise, that goes insect speed. If you troll from a boat you should break out the oars and row, very slowly insect speed to be precise. Bellyboats are great for trolling flies. Not only do they go about the right speed, but also the slight back and forth movement caused by the kicking makes the soft materials pulsate in the water. Fishing a minnow is another matter.
Minnows move quickly to escape their attacker so strip retrieves are the way to go.
Sculpins settle on the bottom and move in short spurts, so a hand-twist retrieve interspersed with the odd short strip can work very well. Imitating the speed and motion of the natural is another key to being successful. The summer is a great time. The mosquitoes are all but gone, the air is warm, the days are long and the trout are cleaned up from the spawn. Successfully fishing this time of year isn t rocket science, you simply have to take a bit of time to figure out the rules before trying to play the game.