Being Obsidian one of the best (almost free) apps in its field, it is a shame that it is not possible to use it without a mouse (o a touching screen). For me is really time and mind consuming to leave my hands of the keyboard for any simple action.
There are a lot of feature requests regarding access to certain function or navigation through the keyboard. But it has not much sense to focus only in certain part of the app when the real benefit would arise when, it is possible to navigate through all panes, side bars and files with the keyboard.
I assume it would be a lot of work but users could help with suggestion about the keys combination to use.
I think that a good approach would be to have some hotkey to enter “navigation mode”, then use tab and/or arrow keys to navigate among all the parts of the screen.
The file explorer would be navegable with the arrow keys and there would be a hotkey to open the contextual menu (and of course the context should be navegable also).
I know this is huge. More than just a feature, is a complete new navigation system to integrate with the app. But I think a lot of users would thank this.