Yes PLUS 2D allows you to change the units of measurement for different job files. go to tools > unit settings. This will display a dialog where the user can feed the new units for measurement.
Yes, the user can add new columns to the table by selecting tools>add custom columns. In the columns thus added the user may feed information about : stock receipt, date of issue etc.
In PLUS 2D the company name can be placed as a header in every RTF output. go to tools > customize header. This option allows you to change the header by placing your company name and logo.