The BluePower Deployer places most directional blocks (ie: hopper, dropper, piston) facing sideways however when placing another deployer block, it places them facing upwards.

This doesn't seem self-consistent or consistent in relation to other deployers such as Tubestuff deployers.
It's is also massively inconvenient should you want to use a deployer to 'print' another deployer and without involving orientation gymnastics.

Can this be changed please?

Places objects in their default state in modern versions so is facing north, could possibly find a way of orienting them the same way if this is for some reason required.