Would someone use search ability in Bible based on keywords?
Instead be only able to display text based on specific chapter and verse number?
Yes, (fuzzy) phrase search should not be missing.
I do not know any details of the Sword API which you intend to use. Does it not provide this anyway?
The interface needs to be much more smooth and functional and presentation more consistent compared to OpenSong.
I asked on sword irc channel about search ability. The search ability in this library is provided through lucene framework.
I posted a note about searching using Sword API to the "development plan":