first question:
is there a technique for rounding glyph corners without distorting the rest of the glyph using FontLab or Illustrator?

what i mean by this is how to make round corners on a P, D, B and other glyphs that have both straight lines and curves, but without changing the curves — just the corners.

second question:
how to create a rounded corner from a corner that consists of a straight line and a curve?