concatenated Artist & Composer Tags

[m.ss.l]

It appears that:
1) for a single album with no AlbumArtist tag & multiple track Artist tags, MS concatenates all Artist tags into a comma delineated list of Artists, and sends this to the Control Point as "Album Artist"
2) for any album, the Composer tags are concatenated into a comma delineated list of Artists, and sends this to the Control Point as "Composer" (essentially "Album Composer")

is this the expected behavior ?
This produces (at least with BubbleUPnP) a real problem in Album listings, giving individual items that are long & unwieldy.
For example if I have Artist formated as Artist.displayFormat={$artist^^: $composer^[^]}
or if I have the Bubble setting "show comoposer in album lists" turned on,
or even just with plain Artist.

Is it possible to have a setting like "Composer.maxlength.diplay = 12", so that a tag would be truncated, for display purposes, after 12 characters, perhaps an ellipsis appended ?