可否限制更新的 Notifications 電郵在1小時內傳送1次

本人使用 drupal 6.2 及 Notifications 6.x-1.0 版本。
最近發現每按一次 "Save" button， Notifications 的電郵就會收到一次。因我害怕死機時，我巳輸入的內容全部消失，所以每輸入一段，就 "Save" 一次。不過其他 Drupal user 覺得太煩(收了多封電郵)。

即使我按了多次 "Save"，可否設定電郵只 send 一次 (在批改的時候或1小時內都可以)?

下面是我的 notification settings:

General:
- General settings
- Notify poster of own posts (Unchecked)
- Immediate sending (Checked)

- Default settings
- Default send interval (Every hour)

- Limits for queue processing
- Number of rows (0)
- Number of messages sent (5)
- Time (seconds) (0)
- Time (% of cron time) (0)

Events:
- Node creation (Checked)
- Node update (Checked) -- I want to get 1 notification within 1 hr even system receive many "Save" requests.
- Node comment (Checked)

Intervals:
-1 | | Never | None
0 | Days | Immediately| None
1 | Hours | Every hour | Short
12 | Hours | Twice a day| Short
1 | Days | Daily | Short
7 | Days | Weekly | Short

大家有無意見?