1 - you are right, Earning tracker considers only BTC. Values might be right in XVG but the BTC symbol is hardcoded.
2 - Seems like the connection error is about version checking. No big deal.
3 - Don't get why it's not benchmarking all selected algos. Need to investigate.
4 - On this one version upgrade (Not true for all versions) you could copy your stats folder over to avoid benchmarks if on the same rig.
See the edit I did to my previous post - I'm also experiencing the same issue as others where the currently running miner isn't closed before the next one is started... or, perhaps, ever closed at all...