I have no alternative to your usage of dir, but i can make it slightly shorter, if you want horizontal alignment, use the rankdir property of graph, to force direction from left to right.
digraph {
rankdir=LR;
a->b;
c->a [dir="back"];
}
To make edges point backwards by default:
digraph {
edge [dir="back"];
a -> b;
c -> a;
}
Then, override the default to point forwards:
c -> d [dir="forward"];
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