This would be awesome. My toons on Illidan have two gbanks full of timeless isle gear they can't use, and I have 4+ "utility" alts (as Iike to call them) on my 16th account on various servers - one PVE for phasing myself over to do world bosses, one dead server for farming rares (9x 300% xp elixirs I can't mail), couple random warlocks in remote locations to summon my raid over, etc....

They could all make very good use of timeless isle gear (instant 496 toon + burden upgrades), xp elixirs to level up and other toons I want, and the heirlooms which are all on Illidan, even though I could phase over and powerlevel a couple of the utility alts I can't get them heirlooms or xp elixirs without server changes.

Yeah... this is exciting. my druid on stormrage, would love to keep her there because I use her weekly to get celestials (and previously nalak/oondasta, although those areas are now dead enough even on Illidan I just solo them there), and eventually ordos once I finish my two cloaks, but she needs some of that timeless gear... the warlock/rogue/priest on various servers could also make use of that gear, heirlooms, and xp pots.

Yeah, this could be very convenient. Now, if only I could mail them gold :/