Created a demo project/scene

CamControl.gd

@@ -0,0 +1,22 @@
+extends Camera
+
+const UP = Vector3(0, 1, 0)
+const camera_speed = 0.5
+
+func _physics_process(delta):
+
+	var speed = delta * camera_speed
+
+	var xform = get_transform()
+	var upangle = acos(-xform.basis[2].dot(UP))
+
+	if Input.is_key_pressed(KEY_LEFT):
+		translation += xform.basis[0] * speed * sin(upangle)
+	if Input.is_key_pressed(KEY_RIGHT):
+		translation -= xform.basis[0] * speed * sin(upangle)
+	if Input.is_key_pressed(KEY_DOWN):
+		translation += xform.basis[1] * speed
+	if Input.is_key_pressed(KEY_UP):
+		translation -= xform.basis[1] * speed
+
+	look_at(Vector3(), UP)

FlareEditor.gd

@@ -0,0 +1,25 @@
+extends Panel
+
+onready var lens_flare = $"../LensFlare"
+
+func _process(delta):
+	for i in $Settings.get_children():
+		match i.name:
+			"FlareStrength":
+				lens_flare.flareStrength = \
+				$Settings/FlareStrength/HSlider.value
+			"FlareBias":
+				lens_flare.flareBias = \
+				$Settings/FlareBias/HSlider.value
+			"Distortion":
+				lens_flare.distortion = \
+				$Settings/Distortion/HSlider.value
+			"GhostCount":
+				lens_flare.ghostCount = \
+				$Settings/GhostCount/HSlider.value
+			"GhostSpacing":
+				lens_flare.ghostSpacing = \
+				$Settings/GhostSpacing/HSlider.value
+			"HaloWidth":
+				lens_flare.haloWidth = \
+				$Settings/HaloWidth/HSlider.value