Please improve the interface – Cool Sudoku, Jigsaw, Killer, Kakuro, Sudoku X Review

While I appreciate the daily puzzles, there are a few frustrating features about the user interface that prevent this from warning five stars. Could I possibly ask the developers to consider these updates? 1. The buttons for pencil and pen are very small and often do not respond to the first touch. I would recommend either of two fixes: a., make the buttons larger and move them to just above the row of numbers; or b., even better, have separate rows of pencil numbers and pen numbers. This would make playing much easier and more enjoyable. 2. Often when playing, one identifies multiple cells that could be a limited set of numbers (for example, the cells that at up to 24 must contain a 7, 8, and 9). But the app does not let players select multiple cells at once, forcing us to enter the same numbers in each cell--a process that, given the small buttons, often leads to mistakes. It would be very useful to be able to select multiple cells to enter pencil numbers.
Review by Alan Says on Cool Sudoku, Jigsaw, Killer, Kakuro, Sudoku X.