The ComboBox of the current Prime version (7) does not permit to use exponents for values e.g. when entering values for thermal expansion coefficient like 24*10^-6 and it also does not recognize its unit which is one over Kelvin (1/K). Prime sees this as a calculation that is not accepted.
Therefore, to simplify input instead of having to use weird workarounds (PTC suggested to define a placeholder unit like: InvK to reflect 1/K) I'd like to see:
Possibility to enter values with exponents
Use all internationally accepted units in the ComboBox