I think you should include not other specific lifts, necessarily, but some changing protocol throughout your lifting period. My understanding of good weight work for roadies and track enduros - based off a document sent to me by another enduro - is that it's really based around the squat and the deadlift, with some additional supporting lifts (I've been doing leg extensions and back extensions as supportive stuff). The squat and the deadlift are really complete (involve a lot more of the body than a leg press).
There are three main phases - a hypertrophy phase of high-rep, moderate weight work to work on form and to lay a foundation for higher-weight work in the future (this also seems like it would be a good place to focus an abbreviated program, like it might improve one's muscular endurance); a strength phase, with high weight, low-rep work; followed by a power phase, backing off of the weight and increasing the intensity somewhat.
Seems to me it would be wise to tweak this based on what specifically you need to work on. For example, I know that I need to improve my short-term power, so, well, i feel as though the whole thing is pretty important to me. If you feel like you're aiming at general, all-around improvement, then you probably want to balance lifting with targeted, specific, on-the-bike work to keep and build your fitness through the offseason.
anyway, as i'm also a n00b with this stuff, i'm definitely hearing other folks' thoughts.