The future of TradeSkillMaster is, has always been, and will always be almost completely determined by user feedback. If you have an idea for how to make the addon better, we'd love to hear about it; simply reply to this thread with your idea!
Try and be as descriptive as possible in your response. Describe how you want the new feature / change to look, act, feel, etc. Also be clear on the purpose of the new feature / change. The less thinking we have to do about what the feature is and what it will be used for, the more likely we are to implement it. If somebody else has suggested the same thing, or you really like somebody else's idea, you are encouraged to quote it in your reply and say so. Most of the time, the ideas that are implemented are the ones that are suggested by multiple people.
How I decide which features get added and which don't.
For reference, here is the old suggestions thread from the beta version.