Hi Alex,
Thanks for the feedback! To create a PDF from multiple guides you can use our [[Help:Guide Details#Section_Prerequisite_Guides|prerequisite feature]]. The Prerequisite feature allows you to combine multiple guides together to form one complete guide.
In the introduction field of your guide you can manually create a table of contents with links to each section of the guide. Take a look at this [http://dozuki-documents.s3.amazonaws.com/dUA2gUDD2FSCGSne.pdf|example guide] I created to demonstrate how this can be done.
Please contact me directly if you have any questions.
Thanks!