I want a list of common spelling mistakes to be automatically corrected. Can I configure the wanted corrections somewhere?
Options | Settings | Active Strings is the right place to define such responses. Check how is by default defined a response to \lamda (a common typo) to immediately correct it to \lambda. Similar responses are defined but not enabled for teh to the etc… Simply duplicate such an instance by right-clicking it and using Copy and Paste. Adjust the value of the Active String and modify the macro fragment in the field below the label On Type to your your needs (make sure On Type is enabled).