Also is there no support for multiple skill trees per actor?
Hey bro, the idea is to create just one skill tree per character; however, you can use visibility and activation criteria to set things up so that an entire branch only becomes visible if a specific switch is turned on. This way, you can tailor the tree and its activation to your story—for example, if the character meets a fire mage, switch X activates, and the fire skills appear, ready to be unlocked.