Missing HTML code and linking from one slide to another

Hello,

I'd like to ask about two issues:

1) when I switch from html editor and then back to it, some code is missing, for example the 'align' tag - why is that?

2) is it possible to link between two non-consecutive slides to allow the non-linear order of reading? (in other words: to allow the reader to choose the next slide from the few proposed?)

And by the way, it's really a wonderful project!