@G.D.:
You could still create the VLANs on the pfSense, and you do not have to route them anywhere, you can point the interface to a custom Gateway, right?
I guess I could, but I'm not 100% sure what you're getting at.
You mean create multiple vlans with different gateways, assign dhcp per vlan, and point IP-helper or DHCP w/e on juniper to each individual gateway?
I guess this could work, and just NAT the primary VLAN and point default route on the switch to that pfsense gateway right?