Interesting idea! I will give it a shot in the next build.
The time capsules definitely need some finer tuning. I was thinking of increasing their life span. Right now they disappear a bit too quickly even for me. 90% of the time I miss the first capsule, because it spawns somewhere on the opposite end of the map. I know I can't make it before it's gone so I just wait for the second one.
Anyway, I want to put together a smaller map to see if it solves the problem.