Better than Adventure! Forum

When using /fill, after inputting the coordinates you can press TAB to auto-fill the block.
I suggest the first result of the list to just be called "minecraft:block/".

Otherwise, if you know the name of your block, you will have to either manually type in "minecraft:block/X"
or TAB and then delete whatever block is auto-filled, to then write the block you want
or scroll down the list until you find your block.

It's a small thing but it would be a great qol, being able to start typing the block you want right away

That would be annyoing for modded bta. Mods use different namespaces and as such dont start with minecraft. If you would want to use fill to fill an area with modded blocks you would be forced to delete "minecraft:block/".