Yes it's on my todo list, not at the top yet, though.

That's the bug I was talking about (the log directory problem).

You can do that using the "user.dir" Java option. Well, almost, there is still a small bug which will be fixed in the next release.
See details in this thread.

(as for the reverse proxy command line argument, I'll put it in my todo list)

Since the rewrite is going to take some time, here is a workaround:

1. Create a new theme (or use an existing one, as long as you can edit the pagereader.css file).
2. Edit the pagereader.css file of the theme you are using and add the following section at the end of the file:
   

   #displayedpage{
      width:100%
   }    

3. Restart Ubooquity after having checked you are using the theme you just modified.

After this, your pages should always use 100% of the width of your screen, no more, no less.

I have not tested it on mobile devices though (lack of time), so let me know if you encounter problems applying this workaround.
(or if it works for you, interesting to know too :))

It's a good workaround.

Don't bother too much though, I have implemented the solution suggested above (simple image file in the directory) as well as the user provided info through local html files in the folder.
They will be part of the next release (no date yet though).

I guess I could add an option to customize the displayed title.
Configuration would look like that for instance:

{issue #} - {comic title}

and display:

8 - Harper's Story 

Not exactly what you requested (the title would still be displayed as a single string of characters) but more flexible in my opnion.

Just so you know, I have not forgotten this issue. I just chose to rewrite the online reader from scratch to manage user defined sizing and double page auto-split. Work in progres...