So I think I'm hearing (and after some more poking around on G2G) that adding database fields is swimming upstream against policy, since simplicity in the wiki db is the favored choice by wikitree. (Would love to hear from Chris/Brian/Ales/Jamie to see if I'm understanding that db design policy correctly)
To that end, and in the absence of a standard for timelines, I may try to create an app that recommends timelines in certain formats, and if entered in that format, allows for parsing out the locations through the API. Tying this to GPS tables might be overkill, but could also be fun.
I keep coming up with fun ideas, but haven't found time to implement any yet!