Since you can save searches in favourites, split searches are an excellent option. Create
default searches with the right settings and you can invoke them with a single click and
then alter them to fit your real searches.

A smarter technique is to add a few unlikely words to your keyword filter and then run a search
on one of those keywords before running your normal searches. Your bogus search will end
up mostly empty but the spambot results that echo your search terms will also disappear from
all of your real searches.