We decided to not support this request, a solution is available in the enterprise 
version.

It should be noted though that there is danger of a regression test failure. 
Some coffee machines would not accept cups higher (vertically larger), so the 
increasement in buffer size would need to go to circular dimensions, i.e. the 
radius.

Luckily, the amount of extra buffer space needed is relatively small, otherwise 
we’d end up with a Müesli cup instead…

Thanks for the bugreport. This needs to be verified, will do at next Grml 
developer meeting -> http://metalab.at/wiki/Grml.org_Developer_Meeting

Marking as release stopper issue.

When applying a normal amount of espresso, cane sugar, cocoa powder, and 
steamed milk to a Grml coffee cup, it will overflow. While this is not an 
exploitable bug, it can be pretty messy to clean up.

Futhermore (see attached screenshot, taken after freeing some of the buffer) 
junk data can be left on the outside, which reduces the drinking experience.

Proposed fix: enlarge the cup.