Basically what is happening is that the programs you are installing are asking for root privledges (meaning, they want to be able to access your entire system.) In order to bypass this you would have to be running as root constantly, which is possible but tricky.

To be honest, I would advise against it. The fact that your computer asks you for permission is a security feature. Basically it means that malware and viruses cannot install themselves onto your computer without your permission. So, while it may feel a bit time consuming, it's better than getting a virus.