yea, playing leads that way, using chords and such, is the basis of rhythm lead...stuff like GnR did, or whitesnake, pretty much all the good 80s style bands. being expressive is great when playing leads, but being fast is important too. now you don't have to be fast all the time, but it's a very good thing to be able to play fast when the music calls for it, because if you play slow during that part, it will either sound good, but not great...or it will feel like something's lacking. i love music that has real slow parts in it, also love music that is so fast i can't decipher it in the first 100 listens. trick is to mix these styles, and to develop this technique, starting from nothing, is just know your scales, and then shred the chromatic scale, that'll work out all your fingers, just do it when you warm up...you know that technique where it's like:
---------------------------------------------------1-2-3-4-2-3-4-5-----------
-----------------------------------------1-2-3-4---------------------2-3-4-5-
-------------------------------1-2-3-4-----------------------------------------
---------------------1-2-3-4---------------------------------------------------
-----------1-2-3-4-------------------------------------------------------------
-1-2-3-4-----------------------------------------------------------------------
etc..etc..
do that, in that direction, then reverse it so it's going 4 3 2 1 4 3 2 1 etc etc, then mix and match all ways you think you can, until it's fairly fluid... now you don't have to do this so religously, once you feel the coordination, go off and noodle into your own improvisations in whichever scales/positions you feel like, it's about fun, not boredom.