(copying my response from another list)

Good work, Arjuna. (Though not a fan of phonetic keyboards that rely on English alphabet sounds due to long term negative impact,) I tried Tamil and Malayalam and they both work very well. One suggestion would be to handle backspace to erase the original input. For example, if I've typed aa in Malayalam, and press backspace, it should retain 'a', no?

- Sundar"That language is an instrument of human reason, and not merely a medium for the expression of thought, is a truth generally admitted."
- George Boole, quoted in Iverson's Turing Award Lecture