You can deep link right now: just set id attributes, and those are
used in place of the leanpub-auto- ones.  Then you can link to the read online version with anchor tags.
​
The Markua spec has both in it:
​
An auto id:
​https://leanpub.com/markua/read#leanpub-auto-todo-in-leanpub
​
A manually set id:
​https://leanpub.com/markua/read#resource-types-and-formats
​