Best Practice when using Google Calendar/Gmail for Interviews

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Our company uses Gmail/Google Calendar exclusively.

In terms of interviewers accepting meeting requests so far I've found that they must first click the Add Calendar link that populates in the invite and then click the Accept/Decline link provided by Taleo to notify to scheduler of their response.

Is this really the best practice or is there an easier way?  This is become more and more of a hassle for our interviewers and lately the Add to Calendar link has completely disappeared from the meeting requests when viewing them through Gmail.  This has resulted in multiple interviews being missed and is causing major issues for our hiring efforts.