This feature has now been integrated! When someone weighs-in or comments on a need you will receive the full text in the email notification. This way you only need to login once you are ready to add your own comment and weigh-in on the need.
We have also added a new feature whereby you are able to choose how often you want to receive these email notifications.
On your 'My Account' page there is an option to receive an email every time something happens or to receive a Daily Digest which sums up all the mails from a particular day or else you can choose to receive no email notifications and commit to logging in regularly to see what is happening in your group.