Alright, I think that in order to be of more help, I should know more about your problem. From what I know, you have your homing rocket all set up, except for the part about turning to face the target. You would like to give it a constant number, e.g. turn 12 degrees towards the target every tick, but for some reason the code won't accept that. It will only take a fraction, e.g. turn 12% of the way towards the target. Am I right so far?
Next would be comparing the three methods, 1. turning a constant value every tick, 2. turning a fraction every tick, and 3. turning a fraction proportional to the distance every tick. A certain error with option 1 would be that if you time it right, you can get the rocket to "orbit" around you, by being to the side of the rocket such that it will never make a turn sharp enough to reach you. In addition, if the constant value you chose was 12 degrees per tick, then if the rocket was 7 degrees off to the right, then it would be 5 degrees off to the left. In this case, (and many others) the rocket would never be perfectly facing the target.
2. You would be able to make this one "orbit" you as well, and the rocket would also never perfectly face the target. It would just get closer and closer, like 2 degrees off, then .7, then .03, then .0008, like that. Of course, that's not really a problem withsuch small fractions, because it's such a small margin that the rocket would hit the target anyway.
3. I'm pretty sure you could make this one "orbit" too, but tweaking the equation would make the circle so small it would hit you anyway(come to think of it, that solution works for 2 as well) It would also get a smaller and smaller margin of error, like 2.
In all, it's 2 and 3 that are the best choices(at least to me). It's just a matter of taste, I guess. Sorry for being so long-winded, I'm just trying to exhaustively cover the question to get you as much info as fast as possible.
(one last thing) I guess my hint in the previous post was way too subtle, but as I said, UnrealEd crashes whenever I try to compile code. Any tips?