New bike - cable ties to tidy up brake cables?

Took delivery of a Giant Boulder from Wiggle yesterday. Had a quick blast this morning to get a feel for it, but one thing has struck me while sitting at work. Should I cable-tie the loose brake cables to the frame? I vaguely recall thinking "they look a bit flappy" as I merrily pedalled along a bridlepath this morning. Now I'm thinking they're likely to get snagged on something. Is this the right/best thing to do?
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Cube LTD 29er
Glentress Trailfairies
But if I get wrapped round a tree, I'm blaming you.
Although without brake hoses you have no brakes
Cube LTD 29er
Glentress Trailfairies
*may not actually be true.