Is there such a thing? Or a text formatting inspector with more features then are available in the customizable bar?
There aren’t buttons, but you can assign keyboard shortcuts to any of the commands in Format > Text > Indents. Ctrl-Opt-Cmd-Right/Left will increase and decrease the left indent, but you can also set shortcuts for the first line indent and the right indent if you use those frequently. This article shows how to assign shortcuts via System Preferences if you’ve never done that.