I'm not sure if Morecambe platform 1 is technically needed as all services could use platform 2. (Not that I'd actually want it to be rationalised further, but I don't think they are ever both occupied)
The two platforms form separate bidirectional single lines. The platform 2 line is the only line which gives access to Heysham (via the Ground Frame).
There is currently one occasion during the day where there are two trains on the single lines at the same time - around 14:20, where a train to Lancaster departs 2 mins before a train from Leeds (via Lancaster) arrives.
Fully bidirectional lines would give more flexibility in some ways, but it's unlikely you'd be able to justify having two units on the branch all day long, let alone find decent paths on the WCML for them.