[Feature Request] Sequential opening training

[Dustydesk]

1. Add button in sequential opening training menu (for example next to Reinit) to mark the line as difficult. Then add button, and function in opening lines training menu to only study lines marked difficult. If not marking them manually, perhaps lines that were not successfully completed in the last training and required Reinit could be automatically marked as difficult.
2. Add keyboard shortcuts in sequential opening training for Advice, Reinit, and Next (for people using compact keyboards without Page Down key).
3. Ability to select multiple variations to study in one session (I have one folder for each opening, and a file for each variation in the folder). If difficult lines feature is implemented, it would be good to be able to select difficult lines from one or several variations.
4. Ability to continue to study next variation in folder after completing all lines in the variation in sequential opening training without having to select close, then select variation, and then select sequential training.
5. Add column in opening lines to show the time and date that the file/variation was last completed.
6. If difficult lines feature is added, add column in opening lines (next to lines column) to show number of difficult lines.
7. Add feature in sequential training to mark move at which a line is studied, removing the need to repeat the same first moves which occur in many lines, but preserving the sequential aspect in contradistinction to position training.

[lukasmonk]

Thanks for the ideas, some easier to develop than others, I will study them.