NAV/NIS - Why can't subscription renewals be added together?

Hi all:

 

Let's say that I have NIS 2010 with 60 Days left.

 

I then visit Express Renewal and key in my activation code for 1 year - but that overrides the remaining 60 days which I have left, having me to contact Customer Service to have it corrected to 14 months. Painful.

 

Isn't there an easier way?