Hello,
the t2x script is probably as old as Turbomole is, so at least 20 years. And I guess that the Bohr radius in the t2x script has not been changed ever since. Feel free to change the script in your local version, we will change that in the official version.
I guess your systems must be very large if you can see a significant difference, and it is good to know that Turbomole also works for such huge molecules
Internally, the Turbomole programs do everything in atomic units, and since the input is also in atomic units, no conversions are needed. For outputs in different units, a value of 0.5291772083 is used.
Uwe