Hi cschweda,
In terms of adding your own development times, once you have selected a film/iso/dev combination you can edit it in the Timer by clicking on the star (Favorites) in the top right corner and editing the existing record to create a new Favorite. Alternatively, you can enter the Favorites menu and click on the + button. Each of these methods does not overwrite the existing data, but instead saves a new entry in the Favorites menu. You then need to use your Favorites menu to access this data as it will not appear in the main chart. The items in the main chart do not have titles, whereas the items you save in the Favorites menus have whatever title you want to input (if you edit an existing time, then that time is used as the default title but this does not overwrite the database).
The notes section of the chart lists the specific notes which apply to each piece of data. In some cases these are custom agitation methods or other unique attributes of the particular combination (as recommended by the manufacturer or the user who submitted the data). The notes are defined by numeric or letter codes. The Notes field is fully editable once you create a Favorite, so you can easily add your own notes as required. I am not sure if there is a character limit, but if you find that there is insufficient room then this is something the developer can look at for a future update.
We tried to incorporate both film and developer lists in the original build of the application, but it was so chaotic that we felt it would confuse people more than help them. In the online chart you can select one or both of the pulldown menus, which makes it quick and easy, but for this app there was no way to make everything fit nicely in the small screen so the process requires you to select format>film>iso>dev. This is a four-step process which we have tried to reduce to three steps by retaining your most recent setting (35mm, 120, Sheet) as the default. But I think that other people will probably make similar requests so it is something we can revisit for future updates. I will ask Martin Man, who developed the software, to follow this thread and we will do our best to keep adding to and improving the app.