You are so kind that you point out the critical design failure but still give a high rate for HoloSchedule.

Actually this is not the first time that I receive a review suggesting a handy button to do group selections but I just hesitated to realize that feature: As the designer of Advanced Settings page, I would feel frustrated if I simply place a button beside each group name for users to click. That is, I thought, ugly and redundant in some cases where you do not need it.

But now I've turned my mind and finally came out with an idea on how to offer this functionality in an 'elegant' way: It may be not a 'best practice' in the industry. It may not come in a so intuitive way. HoloSchedule may not offer you with this functionality until it 'detects' that you may need it. But I want to give it a try.

To conclude, I am now working on this feature. Though it may take another few days to pass the audit from the store after I publish a new release, it will be there. I'll look forward to hear from you then.

Thank you again for your nice review and useful suggestion!