Current focus
There's a few things that are high on my to-do list, like expanding EcoSim Commander and what it can do. As it's the most complex file of all the server configuration files, it also means that the code written to deal with EcoSim.eco can easily be re-used for other tools in the future, reducing the time it takes to develop those.
Alongside expanding EcoSim Commander I will be working on other things as well. The User & Reputation Manager tool is one I should be able to create fairly quickly, although it does require a bit of extra development time for what I have planned: Extended user management allowing you to keep track of who's who.
Adding multi-selection editing to tools where it makes sense (currently only EcoSim Commander) will take some time to develop, but it will be a nice feature to have. It will allow you to select multiple items, for instance within Plants, and modify the values of all the selected Plants at the same time. For number values you will be able to do math on the values of the selected items. For instance you could multiply the values of a specific setting for all selected items by 2, so instead of setting every item to a certain value, they will be doubled according to their current value for that setting.
A tool for WorldGenerator.eco is something I've had people mention they want, so that is also something I will look into in the near future. If you have any specific wishes for this tool, or an insight into some of the data within it, then feel free to contact me.
Further down the road
Adding tools for the other config files (at least those where it makes sense to do so) is a given.
Batch editing of .cs files in the Mods folder, to allow changing specific things across multiple .cs files. This is pretty far out in the future though, if it's even feasible.
Naturally keep improving the tools as a whole, allowing for better and easier editing.