This is a good idea – maybe you could send feedback on one of the Church history pages of LDS.org. That said, the number of developers working for the Church is limited and what they work on is based on the priorities and budgets the leaders in various Church departments set for them (in this case, the Church History Department). So, this may be an opportunity for a third-party developer, to make an unofficial app.
Samuel Bradshaw • If you desire to serve God, you are called to the work.