Don't you sort of do it already? When I opened this account, I imported one acct from LJ, and then turned around and imported another acct -- effectively merging like I'd wanted to all along, under the name of this third account. Since LJ and DW are (mostly) clones, there had to be something in that function that let you do that.

Or is it that in merging into new, you'd lose the ties connected the first accounts? Frankly, if you'd said (at the time), "you could rename this acct and just transfer all old-name to new-name, OR, you could create new acct and merge these two old accts into new-acct BUT you wouldn't be tied to old acct in any way"... I'm not sure I wouldn't've have said, 'that's fine, get rid of the old, I'll deal with being not-tied so long as I can have one full journal that has everything."

Actually, I'm pretty much positive that's exactly what I would've said, but door #1 was my only option.