Setting @twitter turns off default email reminder

Just for the record, I have twitter reminders set to off by default. Today I've noticed that when I set @twitter for an event it turns off the email reminder that is set by default. In order to have both email and twitter reminders for this particular event I need to add the @email tag. This is a bit inconvenient. I'd prefer to have email reminders set as always on, no matter what other ways of reminding me I add for the event.