Originally Posted by
thumpism
If you don't need the steerer length then by all means cut off the threaded portion. If you need all the steerer length you can get, don't be shy about clamping on the threaded portion. I've done it. If you feel the need for reinforcement or additional strength, use Bondo or JB Weld in the threads and smooth it.
Filling the threads with Bondo or JBWeld won't do anything to strengthen the threaded section. You could, however, stick a threadless adapter in the steer tube to reinforce the tube from the inside.