let the comment author choose to subscribe for comment or not?

This plugin is cool thanks for developing it.

However, there are some tiny but very cool features i think and expect, should be added to this plugin.

1: let the comment author choose to “subscribe or not” to comment to receive reply comments to his comment like other plugin “subscribe to comment reloaded”. as it is required by some European countries

2: should be contained a simple GUI having few settings to choose from.

I request to update it.