I agree that the sliders can be jumpy but borno has it right, pull the drawer to widen them for better control. However, in the v1.0 release there is a tool for many adjustments called the Targeted Adjustment Tool (TAT). It allows you to click on the colour or area you want to adjust and drag up or down. It can be more precise as generally more than one colour is involved but we may not be able to perceive it.
BTW: v1. is released Feb 19. and 2 weeks later the beta will expire, but you can download a 30day trial to evaluate the release. It will cost US$199.00 til April 30, then price goes up to US$299.00. Edu pricing is US$99.00
I LOVE Lightroom