Backtagging: Always good. I may prioritize newer threads if I'm feeling pressed for time, though, or request to plan generally how things went in order to fit into a timeline.
Threadjacking: Just fine, and ask if you aren't sure about my plans.
Offensive subjects: If you're not sure a topic's okay, feel free to ask me. I can cope with most things in the service of exciting plot.

Preferred contact method: You can private plurk me (yorisearching) at any time, or send a PM to this account. I will be happy to switch to other instant messengers on request for a conversation, if you're more comfortable with them, but I don't leave those on.