events calendar - customisation

Hello,

I would like to make some modifications to how the event calendar works and I was wondering whether the following is possible:

http://www.qbbs.vent2me.com.au/events/2015/06/tax-return-lodgment-including-companies-and-super-funds-where-the-tax-return-is-not-required-earlier/

Instead of the fields:
'No' 'Maybe' 'I'm attending'

Can we change to one field saying 'Remind me of this date'

On the success page instead of the text saying:

Excellent! We've got you marked as coming and we'll see you there!

I would like it say 'You have subscribed to receiving notifications regarding this ATO deadline'

Basically I want the events + calendar to be used to subscribe to key events etc - they aren't physical or virtual events but rather important reminders.

And what about allowing people to save the event to their google or iphone calendars? is this possible?

Thanks in advance,