GypsySolo - Arthur, Barbara and Carla - and probably others from LDW - are constantly on the forums and read every post. They look seriously at all the suggestions and sometimes incorporate them into new versions of games. However, you have to realise that there's only so much they can fit into one game unless you want to pay a LOT more money for each one. It's a matter of time and also how well any new ideas can be fitted into the existing game.
Keep posting any ideas you have - you never know when you'll have an idea they love too