The best tool I've seen for this is a double wheel tracing tool. The inside wheel is stationary and the outer wheel can be adjusted for your preferred seam allowance. When you use the colored tracing paper, run the inner wheel around the pattern and the outer wheel will imprint your seam allowance.
I work in an office and so have easy access to a photocopier. I simply refold the pattern sheet so that I can create a number of A3 copies of various sections of the sheet. I then stick them together with tape - like you do with downloadable patterns. It's then easy to add my 1 cm seam allowance with a ruler and cut out the pieces. I do have to remember to check if I need to do multiple copies though - most Burda patterns have pieces that overlap even for the same item.
It means I don't have to trace and I can use my lunch break for extra sewing time!