Since Claymore Dual allows to mine ETH and LBC simultaneously, I see no reason not to.

ETH's reported hashrate slightly decreased, but the pool behaves as if there's no difference. So it's like + ~6 LBC per day for free.

Here are the settings:
-epool eu1.ethermine.org:4444
-ewal WALLET
-eworker WORKER
-epsw PASS
-ethi 9
-eres 10
-r 0
-tt 75
-ttli 85
-tstop 90
-dbg -1
-mport 0
-mode 0
-allpools 1
-dpool lbry.suprnova.cc:6256
-dwal WORKER
-dpsw PASS
-dcoin lbc
-allcoins 1
-dcri 50