Only vibrate when there are no active notifications Is there a way to tell android only to vibrate if there are no active notifications?

Example: I use telegram messenger, and when receiving a message the phone vibrates. Even so I do not use the phone in the meantime, it will vibrate again for each incoming message. This holds also true for email notifications, SMS etc. This is very annoying when you take part in Group chats in Telegram or WhatsApp, as in a short timeframe lots of messages can arrive.

What I want: I only want the phone to vibrate ONCE. I then know "okay, there is something new that i need to look at, but I am currently busy and will do it later". Until I do not check the phone, I do not want to receive any further vibrations (the led light on my MotoG is flashing already, telling me that there are notifications).

Can this be done?
You could use tasker this way:
-First, deactivate notification sounds for all apps.
-Then, configure tasker to suit your needs. This resource might help.
Note that root access might be required.