1)I want an option which can stop realtime preview on low-spec machines while editing and works seamlessly, and later we can schedule editing
2) I want a scriptable interface where I can automate repeatable tasks via api/plugin/console whatsoever.
1) Unfortunately, I will not focus on low-spec machines. The future is high end, and my app will cost money. It's very likely people with low-spec machines won't pay for my app anyway. The main reason for this, however, is that low-spec machines would require me to do optimizations that will don't really matter for decent machines (read: a lot of work, with no ROI).
The least I need is 8GB of RAM with 1 GB of video RAM, even though I recommend 16GB of RAM + 2GB of video RAM
2) I will allow for repeatable tasks to be automated, and I do think I will allow some scripting, even though I will do my best to keep it to minimum.