I’m currently plotting (between two other projects) my next PIE adventure with the modified rules I’ve been working on since last week. This one will feature the PIE team having to time travel to February 14th, 2016 in order to avert the end of the world.
Given how many times The Real Ghostbusters time traveled I feel no problem having time travel in an adventure. My biggest worry is that no one will get the reference in the plot of the adventure.