The ink editor would be cool if it had more options.
The ink editor would be more useful if it had the ability to add punctuation marks- like adding a comma where there should be one.
Also, as far as spelling goes- for those words that the spelling checker doesn't catch, it would be nice to be able to delete or add single letters rather than whole words.
I will probably not be using this feature as it is; it seems like it is more trouble than it's worth right now and doesn't have the features I need. However, if this feature is expanded it would make my life (as well as the lives of many teachers) much easier.
It would also be nice if there was the ability to change letters to uppercase or lowercase, to switch positions of words, and to be able to add periods. I seem to be able to add commas just fine though.