3 should be fine with this. Not sure where to put paths for different system configurations. Maybe variables for the task to parse, setting environment variables, let the user change it and supply a windows and linux version ...

2 drag and drop is obviously not implemented and there is no automatic detection of slurs but the rest should be fine with this.

I left 2 todos in. Both have something to do with UI and how the Tasks should tell the user if something is wrong or could be wrong.