The *cautious* way to use warp openers is to also use warp closers. On the same turn, you can open a warp point, send a fleet through and then close the warp point. Talk about your ultimate hit and run technique...
OT:
Anybody know who this idiot is who gives newcomers like Tobiasds a 1 star rating for asking a decent question. Does not work well with the image off a friendly forum.
Whoever you are:
Stop it. It's not funny, it just proves your a moron.
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Never trust a cop with rubber gloves.
I've no idea if you deserve my 5 stars or not Tobias, but I've just rated you 5 in an attempt to balance the low rating you could not possibly have earned in just 2 Posts.
Not many people do care until they get a low rating. The reason it's important here though is taht it's not very welcoming for a newbie to come here asking for help and be branded a "one-star" for no reason at all.