We were able to collect some answers for two of your suggestions.

- Jump and Call Wyvern
We currently have no plans to make adjustments in this direction as it'll move away from the concept of dragoons being strong while they maintain their wyvern.

- Drakesbane
The Drakesbane weapon skill isn't meant to be used in a skillchain with Stardiver, therefore we will not be making any adjustments with the premise of skillchains in mind.