Studio allows running a single line of Lua that can permanently update object properties in editing mode. This allows for precise and calculated values for object properties, including Part.Position or CFrame.
Example moving a Dummy Rig by single line Lua instead:
Yes; the great thing about using lua is that code can be written on single lines.
For example:
if not started then return end
This logic is the exact same in the studio Command Bar, which allows whole scripts to be written in a single line. You can write code straight in without adding new lines, or simply copy and paste an existing script into the bar.
Or you can not have semicolons, although it’d look fairly ugly. New statements in Lua, unlike other languages, don’t require the semicolon’s presence to start a new statement but you can do it. It’d probably be better to do it for conventional reasons anyway.