With Roach's spells of inconsistency, mention was made of the bowlers' run ups being a bit poor; something that is also a pet peeve of Pattinson, so I wouldn't be surprised if he doesn't get the consistency you'd like to see.
I really regard the use of Beer on the new ball quite highly, not because it came out of nowhere, but because it practically doesn't. If one has watched him bowl enough times, they'd probably have seen him come on early and slide a new ball through an opener. Of course, with this team's list of WA personnel, to not know anything of Beer would be inexcusable, but it does show that they're acutely aware of their strengths and that Clarke is not merely executing surprise tactics, but preparing very wisely.