AutoTab Feature:

AutoTab Configuration

Overview
AutoTab is enabled or disabled from the preferences dialog under the EDITOR tab.  Auto-Indent/Tab will automatically each subsequent line of code base on the previous line, based on tabs and spaces.

You have to additional options to define what will escape the feature during edit.   You may tell perl scripting tool that when you press backspace you DO NOT want the next line to be automatically indented - AND/OR - you can specify that when a cursor key (up, down, left, right) is pressed that you do not wish the next line to automatically be indented.