Add the following to HUD.ini


[MiniHealthDisplay]
Enabled = true
Background.Width = 72
Background.Height = 30
Background.Texture.File = d6hud_ext.tga
;Background.Texture.Quad.Left = 0	; default value is 0
;Background.Texture.Quad.Top = 0	; default value is 0
;Background.Texture.Quad.Right = 72	; default value is Background.Texture.Quad.Left + Background.Width
;Background.Texture.Quad.Bottom = 30	; default value is Background.Texture.Quad.Top  + Background.Height
Background.Position.Centered = true
Background.Position.X = -200.0
Background.Position.Y = 0
Text.Font.File = font18x24bankgoth.tga
Text.Font.AverageCharacterHeight = 14
Text.Position.X = -212.0
ForceInfoDisplayDuringLowHealth = true
LowHealthThreshold = 50.0
HealthInfoFlashDuration = 2000 ; aka 2 seconds
LowHealthBlinkDuration = 250 ; aka 0.25 seconds