I'm currently working on a bit of a custom pathfinder world built from the ground up. First step is the races and I really wanted to try and balance the three core races in terms of power. All in all, I've decided to work for a 10RP per race option (I know RP is probably a terrible way balance races, but it seems decent enough for my options.)
For those of any interest on the actual race template.
Size: Medium (0RP)
Base Speed: 30ft (0RP)
Ability Score Racial Trait: Dex +2, Wis +2, Strength -2 (0RP)
Standard Language (0RP)
Racial Skills: Fly, Acrobatics (1RP)
Trait: Nimble Attacks (2RP) Weather Savvy (1RP)
Supernatural Ability: Energy Wings (???RP) (See below description)
tl;dr What is an appropriate RP value for this flight modification?
As a full round action the Arluxian can channel their natural energy into the wing runes on their back. Doing so causes them to sprout ethereal wings of their natural energy colour. During the time the wings are active they gain flight and a base flight speed of 30ft plus an additional 10ft for every 2 dexterity modifiers (40ft at +2, 50ft at +4, etc). Their base flight manueverability is clumsy and improves by 1 modifier for each 2 dexterity modifiers. Energy Wings lasts for 1 minute(or round, I haven't decided yet) + character level + dexterity modifier. The Arluxian can dismiss the wings at any time as a completely free action, or they vanish at the end of the time period, causing the Arluxian to fall to the ground and incur any falling damage that might happen as normal (Reflex save Half).
I know standard flight is a 4RP buy in the AVG, but I'm not sure where this falls. Is flight alone mechanically powerful, or is it the permanency of the effect? As bonus questions, what if this became a 1 or 3/day power instead of at will?
As you can see from the template above, depending on how this question turns out, I might have a significant RP buy left or next to none. I'm budgeting 6RP for the ability right now, but it might be much weaker than I think.
I also wouldn't be completely adverse to any opinion on the race as a whole (despite not having bothered to include the flavor text out of laziness. But, the question is the main point.