i tested stk 0.8.1 the first time and i noticed some things.
(i also have installed 0.8 and a svn (between 0.8 and 0.8.1)
1:i don't see the bubblegum-shield on other karts (one time when i threw a plunger on someone, a bubblegum-shield was visible)
2: sometimes when i "activate" a bubblegum, it drops immediately without a shield
3:there are still these "hit messages", i thought they were removed
4: driving over bubblegum does not destroy your shield
5: using a bubblegum makes the bomb disappear (i don't like this, because you can get off the bomb so easily)
6: bug with beblious-addon-tracks (see image)
and at least i have a small idea too:
chosing the number of rounds in a gp-race for every track (not in story mode)