beamed stem rounding problem

[Kieren Richard MacMillan]

[ Mac OS X 10.2.8 (Fink);  Lilypond 2.1.7 ]

Hello, development team --

I love the look of the rounded stems on quarters, eighths, and beams 
(outer edges) -- very warm and "engraved" looking.

However, if you look closely, it's creating a divot on "inner notes" of 
a beamed group:

beamDivot.pdf
Description: Adobe PDF document

Perhaps the "rounding function" can/should be cancelled on stems of 
inner notes on a beam group and the beams that connect to them?

On that topic, what was the logic which informed the decision behind 
having separate beam elements instead of a single graphic/PS object per 
beam (i.e., across the entire group of notes)?

Best regards,
Kieren.