How do you feel about adding an icon for settlers? I do not like it being only unit (?) without any icon above it.

For now, this is an easy fix for others who might like this idea:

In UnitFlagManager.xml, add these two lines from line 86:
<!-- Settler: -->
<Image ID="ZUM_SettlerIcon" Anchor="L,C" Size="18,18" Offset="0,0" IconSize="17" Icon="ICON_Citizen" ToolTip="Settler"/>

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In UnitFlagManager.lua, add these lines starting from line 2102:

-- ==========================
-- Settler icon
-- ==========================

flag.m_Instance.ZUM_SettlerIcon:SetHide( true );
if GameInfo.Units[pUnit:GetUnitType()] == GameInfo.Units["UNIT_SETTLER"] then
flag.m_Instance.ZUM_SettlerIcon:SetHide( false );
nothingShown = false;
end

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With these changes, you will not be able to change the icon color, but as I do not use this function, I did not include it. It is a bit more involved to do that.

Greets