(My english is bad sorry).
Ok so, have you want to build a shape, or any kind like with the same block? But you have to place and build it youself, so this suggestion will be useful for lots of players!
Open with amors, or weapons tab (which is doesnt have anything) will have some kind of tools that can be use:
● Axe: Build any shape as you want, place any block on build area then break it with the Axe, and same with the second one (its must be same block). After that, hold right click with the tool in your hand in mid-air and a box/shape will be auto-build with the block has been selected.
To be make other shapes such as circle or triangle, you can hold in mid-air when havent select any blocks:
︎ Triangle: Shape-Yes, box-no
︎ Hexagon: Shape-Yes, box-no
︎ Circle: Shape-Yes, globular-yes
(Note: It can be disable or able to fill all the block inside the wall around the box you built, option to change is double click on the axe in inventory tab.)
● Shovel: Allows to break blocks in an area, it goes the same with the axe tool, but instead of placing blocks will be breaking blocks. (Only delete in as a square and cube)
● Pickaxe: Use for break the floor.
● Snowball: Like a TNT snowball, allows to explode the floor as well, It will work and useful at making pools or whatever.
Extra: The floor breaking height limit will be 15 blocks below if using Snowball or Pickaxe tools.
Extra 2: There will be an message sometimes in chat will say “Tools are helpful! Open the armor/weapon tab in inventory to use.” So it will more noticeable for players who doesnt know of Hive forums
Extra 3: Add a command to able or disable the water/lava can be flow down, use to make rivers, waterfall, etc. Also a message in chat will apear with a command to use when player placed water or lava bucket.
Thats my idea! Thanks for reading. Ideas is reference to BetterEdit.