Yes
Modify the GalaxyScenarioDef file in GameInfo folder.
planetItemsTemplate
templateName "Template:DefaultHomePlanetSetup"
subTemplates 0
groups 6
group
condition
type "PlanetOwnerIsRaceNormalStart"
param "Tech"
owner "PlanetOwner"
colonizeChance 1
items 3
item "Tech:Module:FrigateFactory"
item "Tech:Frigate:Constructor"
item "Tech:Frigate:Constructor"
group
condition
type "PlanetOwnerIsRaceNormalStart"
param "Psi"
owner "PlanetOwner"
colonizeChance 1
items 3
item "Psi:Module:FrigateFactory"
item "Psi:Frigate:Constructor"
item "Psi:Frigate:Constructor"
group
condition
type "PlanetOwnerIsRaceNormalStart"
param "Phase"
owner "PlanetOwner"
colonizeChance 1
items 3
item "Phase:Module:FrigateFactory"
item "Phase:Frigate:Constructor"
item "Phase:Frigate:Constructor"
group
condition
type "PlanetOwnerIsRaceQuickStart"
param "Tech"
owner "PlanetOwner"
colonizeChance 1
items 10
item "Tech:Module:FrigateFactory"
item "Tech:Module:CapitalShipFactory"
item "Tech:Module:MetalExtractor"
item "Tech:Module:MetalExtractor"
item "Tech:Module:CrystalExtractor"
item "Tech:Module:CrystalExtractor"
item "Tech:Frigate:Constructor"
item "Tech:Frigate:Constructor"
item "Tech:Frigate:Scout"
item "Tech:Frigate:Scout"
group
condition
type "PlanetOwnerIsRaceQuickStart"
param "Psi"
owner "PlanetOwner"
colonizeChance 1
items 10
item "Psi:Module:FrigateFactory"
item "Psi:Module:CapitalShipFactory"
item "Psi:Module:MetalExtractor"
item "Psi:Module:MetalExtractor"
item "Psi:Module:CrystalExtractor"
item "Psi:Module:CrystalExtractor"
item "Psi:Frigate:Constructor"
item "Psi:Frigate:Constructor"
item "Psi:Frigate:Scout"
item "Psi:Frigate:Scout"
group
condition
type "PlanetOwnerIsRaceQuickStart"
param "Phase"
owner "PlanetOwner"
colonizeChance 1
items 10
item "Phase:Module:FrigateFactory"
item "Phase:Module:CapitalShipFactory"
item "Phase:Module:MetalExtractor"
item "Phase:Module:MetalExtractor"
item "Phase:Module:CrystalExtractor"
item "Phase:Module:CrystalExtractor"
item "Phase:Frigate:Constructor"
item "Phase:Frigate:Constructor"
item "Phase:Frigate:Scout"
item "Phase:Frigate:Scout"
This is the area you are looking for. Study the planetItemType just about to figure out what to put in next.