Custom units in build unit string

[ASTDan]

I think it would be cool to be able to define custom units in the build unit string function.  For example (%, dB, or Dan's).  The ability to include custom units would remove the burden to include every unit in this dialog.  Adding custom units would also help people who have large complex calculations.

[crcarlin]

IMO it'd be fine to say that if a customer unit was specified, the user would be completely on his own for all conversions.

I have a wire with units of log(Ohms), and I need to make sure nobody attmpts to use the value as Ohms. I'd be happy if Labview simply required that the user match the text of unit strings of unknown units.