Allow website for amount of time per day (eg 1hr per day), not just period of time (eg 7pm to 8pm)
Eg. If facebook is allowed for 1 hr per day, you can visit the website in four 15 minute increments throughout the day, or a single 1 hr session, after which facebook will be blocked. It could also be allowed for 1hr between a certain time period, such as 7pm to 10pm. There are MANY common use cases where this feature would be needed. Imagine you want to watch a bit of netflix every other evening after work for instance. You only know you'll reach home between 7pm to 10pm, but you're not sure of the exact hour. This is the only significant missing feature that I've found in Pluckeye so far.