Setting meeting agenda attendance default to "No"

As our website administrator, I was asked if it was possible to set our meeting agenda default attendance setting to "No".  This would force our members to check Yes or No to signify they will/will not be attending a particular meeting.  I was told that other clubs have made this setting possible, but I cant find it in the admin settings pages.
when logged in as a member, the attendance setting question appears at the top of the agenda and defaults to "Yes".  We want this default set to "No" which will force our members to sign in/look at the agenda, and make their attendance selection, instead of just assuming they will be attending.
Please advise

David Meigel
Secretary/Webmaster
Foothill Toastmasters #1070

The default is "uncertain".  The value changes to Yes if the member clicks "Yes" on the agenda or signs up for a role, or if someone with website permissions assigns a meeting role to the member 

I am not going to hard code a No or Yes default.  If I did that, you would never know when the user actually set the value to Yes or No or if it was just the default.

The default value is purposely set to "Uncertain / Unknown".

If you use the Agenda Emails, it should be fairly straight forward to train members to report their attendance from their email inboxes.