The Other One-
It's cool to add things to what you came up with when you were humming. You probably just came up with a basic melody, if you did that awesome. The point of humming is just to get those inner ear ideas out, and once you become alittle more familiar with this practice try getting a little recorder, play the rhythm track and then hum the entire solo into the recorder instead of measure by measure. You'll see then your solo idea will have alot more flow to it. Write it on tab, or even better midi (using powertab or something). Then you can easily go back and edit it, which is always the case when you start this practice. "Don't think too much and feel the music" is the best advice to follow when humming out a idea. If you make a mistake don't worry it, you can always go back and edit it with powertab. :) As you get better and practice this more and more, you'll actually learn alot about your own creative way of playing and soon you'll be able to pull out these things when improvising. Just like you learn other guy's solos and you become more like them. This way you'll develop alot of your own creative ideas and maybe even your own style.
As for the speed thing, yeah it isn't everything but it also isn't something to neglect. You should work to achieve speed just as you work to achieve everything else on the guitar. I know no one is saying to neglect speed, but it's not always noted that it is an important part of playing from those anti-speeders. I too don't like mindless wanking on the guitar, just because I don't feel it. I like guys like Slash and Page who use speed but also have a melodic outline to there solos.
"My whole life is a dark room...ONE BIG DARK ROOM" - a.f.i.