Agree wholeheartedly. I first started out on the Oceanic Servers back when they were still up, when they were merged with the NA servers I ended up on Begeren Colony but have recently learned the majority of Australians now play on the Harbinger and thus I'd like to play there instead (at least some of the time) as the Begeren Colony is fairly quiet in the evenings for me. I also wouldn't mind giving a PVP server a go. But I'm Legacy Level 19 on Begeren Colony and really don't want to start all over again (would feel like 2 years of work would be down the drain). I understand that a character transfer would copy the legacy across once (at an overpriced cost of 1800 CC...), but after that I'd be working on two legacies separately...
I don't care if the Legacy names have to be different on different severs and I don't care if the Family Tree isn't cross server either, so long as all of the various legacy achievements and unlocks copy back and forth. I can't imagine this would be overly complicated to do as we already have account wide unlocks.
A quick Google Search indicates this is quite a popular idea, so come on BW, get it done!