Under the General option limit the number of undos by setting a value for the Undo History Size text box. For an unlimited number of undos set the value to 0.

If you want the previously worked on model to automatically be reopened when you start Workbench check the Automatically Reopen Previous Model When Started checkbox.

You can select the language to be used in the GRT shell by chosing a language from the drop down listbox Interactive GRT Shell Language. Currently there is a choice between Lua and Python.