Options dialog box can be accessed by selecting Settings | Options... menu command.
Auto convert text: Convert input text automatically if the keyboard is idle for 10 seconds
Tamil consonant numerals: Subscript numerals (ex: க₂, க₃, க₄) are used for க, ச, ஜ, ட, த, ப consonants if this option is selected
Screen color: Specifies the screen color
Text color: Specifies the default text color