Please, add the ability to select what column should display the tree scructure. The EQTL always shows the tree structure in the left-most column, but there are situations where it is necessary to have columns at the left of the tree. See attached image from MS Project and attached image from an application we are writing. We are using the indicator as an extra column at the left of the tree, but this is just a work around.
You may want to check the Virtual Treeview component by Soft Gems (www.delphi-gems.com). It allows any column to be the tree column.