I also ask myself what to do when I become lucid. Just because I will have set up a list of things I want to do before then, and I need some time to make up my mind about it. Also, I try to exert a lot of control in my dreams, and, like DuB, I feel not doing so would be more likely to kill my lucidity than it would be to maintain it, seeing as some of the first things I usually think of are clearing my mind, rubbing my hands and solving a couple of mathematical problems (to enhance conciousness and help maintain lucidity).

Also, although I'm not saying anyone who says exerting little control over your dreams is wrong (as what I just said is what applies to me personally, not to the entire world), it's important not to forget that when you "discover" a rule of lucidity like that, you're actually creating it for yourself. That is to say, if you're convinced saying your name while lucid will wake you up, then it will, and likewise, if you're convinced exerting control over your LDs will make you lose them, it will.

In other words, though you might be right in that thinking too much has negative effects on your LD, this isn't true for everyone, and it isn't true all the time, but it will be if you think it is.

That is all