That's indeed a smart suggestion, parkfell. I fully second it. Single-engine is cheaper to keep current - and there's some chance you might get to do some single-engine flying as a weekend job. Glider towing for a gliding club maybe? Gliding club members don't get paid for any job they do, be it flight instruction or towing (at least in the UK), so it will be more of a hobby than anything else - but at least you will keep current, build some time and, most importantly, stay motivated. MEP is useless unless you are applying for your first type rating. There are relatively few MEP aircraft around, they're very expensive to run and insure and a novice is extremely unlikely to be trusted with flying one of them in a non-training environment. So, if you're not an experienced GA pilot already, you can forget about the MEP rating being anything other than an expense. And it would better be fresh at the time of your airline application.