Hello!
I have found the way of adding those needed buttons as nextpage and more in Chenpress.
I found a code via Google Code Search and added to Chenpress. The creator was Felipe Coelho, do you know him? There is no way of contacting him.
If you don’t understand Spanish, you can write me, or ask here, and I will try to translate the post into English.
I hope it could help you.
Galder
