If you create a JS macro that is triggered on file open, with the contents "komodo.view.scimoz.indentationGuides = komodo.view.scimoz.SC_IV_LOOKBOTH", it should give you the indentation guides without the whitespace actually there. http://www.scintilla.org/ScintillaDoc.html#SCI_SETINDENTATIO... has some explanation of the possible values.
Comments
If you create a JS macro that is triggered on file open, with the contents "komodo.view.scimoz.indentationGuides = komodo.view.scimoz.SC_IV_LOOKBOTH", it should give you the indentation guides without the whitespace actually there. http://www.scintilla.org/ScintillaDoc.html#SCI_SETINDENTATIO... has some explanation of the possible values.