Useful with room for improvement

First of all: this app is very useful - helped me to improve note reading significantly. Still it there is room to improve to earn the 5th star:
- a small bug: if there are many notes with accents the last note moves over the edge of the screen
- wrong scope of accents: different to real notes the accent is valid only for the very next note - hence bar lines should be introduced
- urgently need a mode to have both keys on one screen
- in general: limitation for 6 lines is a pain
- to learn reading with a constant pace it would be useful to have a clock tick or a visual pace maker + measurement of constance (histogram, mean value, standard deviation, etc.)
- last not least: complement random notes with some typical harmonic patterns
And yes ... I would be willing to pay for these additional features

FloBo7437 about Piano Notes Fun, v1.3.3