to constantly tinker with something.
Also: Lucas (noun) - someone who is never satisfied with something. someone who always strives for perfection, even though the final outcome is not always the best. Someone who should leave well enough alone. (see George Lucas & Star Wars)
Jimmy kept lucasing his final architecture model, until it finally caved in on itself.
something that is extremely slow moving. (excruciatingly slow.)
"The pacing of that movie was molastic, I thought it would never end!"
"This internet connection is molastic. I've been trying to download this file for an hour."