Redmine

Confirmed with 1.0-RC1

I would stick to the spaces as it is just easier to visualize. Maybe just two spaces per indentation?

Simple quick and dirty fix.

in lib/redmine/export/pdf.rb, find the # Tasks comment then change the following (about 6 lines down)

if i.is_a? Issue
  text = "#{i.tracker} #{i.id}: #{i.subject}" 
else

if i.is_a? Issue
  text << (" " * i.level)
  text << "#{i.tracker} #{i.id}: #{i.subject}" 
else

that will give you one space of indentation per level.

To change the colour of parent tasks change the following (Near the bottom of the file).

l_width = ((i_late_date - i_start_date+1)*zoom) if i_late_date
l_width ||= 0

pdf.SetX(subject_width + i_left)
pdf.SetFillColor(100,100,100) # CHANGE HERE

pdf.Cell(i_width, 2, "", 0, 0, "", 1)

l_width = ((i_late_date - i_start_date+1)*zoom) if i_late_date
l_width ||= 0

pdf.SetX(subject_width + i_left)

if i.leaf?
  pdf.SetFillColor(200,200,200) # Normal colour
else
  pdf.SetFillColor(100,100,100) # Parent colour, change to fit your preferences
end

pdf.Cell(i_width, 2, "", 0, 0, "", 1)

Note that this doesn't put the downward pointy bits (That is a technical term) on the parent bars, just changes the colour which is good enough for me at the moment.