Less rows in tag panel when placed horizontally

I was wondering if it would be possible to reduce the rows of the tag panel when it is placed horizontally at the top of the screen.
Like for instance reduce it to 3 rows from 6 now and give every row you have now half the space it had.
Maybe as an option so you can choose between the 2 ?
I don't know if this would be easy enough to do but it certainly would be appreciated.