I know this is almost nothing short of impossible, but this is more directed towards badspot. It would be amazing if Blockland had a separate program dedicated to building. It would use a drag and drop brick interface with fast menu browser and placing. (If possible with the limitations of datablocks,) you could resize bricks with ease. You could quickly build many things. Fill tools, presets, quick custom brick installs, plugins, this would be arguably the best update in the game.
It would all be controlled the way roblox studio is. There are 4 tools, the Selector, the Mover, the Resizer, and the Rotator. Each works by showing up with 3 lines on each axis. Pulling on them can do different things depending on the tools. There would also be a colorset editor and menu with a mouse-hold grab to select multiple bricks at once. When you are done, a save is generated for you and it will be automatically moved to your save folder.
So, I will end it with that. /discuss