anyway, as it happens, after all this time not knowing, as soon as i posted the above question, i managed to find the answer (well, kind of ), in the FAQ .. d'oh?!
anyway, the only thing left to say (i guess), is that ..
(i) it would be nice to have the option to "flip" the tag displays between v1 + v2 (great for checking that sinc between v2-v1 hasn't truncated long album names etc)
(ii) would also be much neater to have the option to "scroll" onto extended tag info (rather than have to hit alt+T, which isn't hard but ain't as neat as it could be).
for example, check out the tag editor i used to use here :