Trainer Conerns - Need Input

So I had my first trainer ride tonight on my Kurt Kinetic.  There are probably 2 major concerns I have that I would really appreciate your input on.

 1)  The screw that holds the magnet on the spoke came flying off about halfway through the ride.  The screw was not screwed in completely due to the fact that the magnet would not fit very snuggly on the spoke.  I already forsee this being a chronic issue so any suggestions?  Would glue work or is that a no no?

 2)  I am using my P2C on the trainer and there is only enough room for my current bike computer.  Just to use the Kurt power meter that I bought with the trainer I had to use several of the zip ties they gave me, and wrap the cord all the way around the bike and sort of ghetto rig it to the handle bar.  Are there any better options than this?  I know one of you out there has had some of these issues.  I cannot imagine having this thing on here for races because it seems like it could easily fly off or something, but at the same time I can't imagine going through 1,000,000 zip ties every time I want to attach the computer for a ride on the trainer.  I hope this was clear enough.  If not........sorry.