Nearly 17 years later I found this thread and gave me a solution for character spacing, thank you guys!
As I love to see code snippets here is an example for this matter (thank you Rob Barendregt): <Element>
<Visible>(A:CIRCUIT GENERAL PANEL ON, bool) (A:CIRCUIT AVIONICS ON, bool) && (L:XPNDR_status, enum) 0 > &&</Visible>
<Position X="24" Y="29"/>
<Text X="410" Y="25" Luminous="Yes" Length="4" Font="Arial Narrow" FontWeight="900" Color="#D7D7D7" Adjust="Center" VerticalAdjust="Center" Multiline="No" Fixed="Yes">
<String>%((A:TRANSPONDER CODE:1, number))%!04d! </String>
</Text>
</Element>
The important parameters for spacing the 4 digit Transponder code equally alongside my four adjusting knobs are:
X="410"
Fixed="Yes"
Length="4"
Again, thank you all.