Not even vaguely? It really would be interesting to see how Jack and Rodney met. Skip the part with the smut and sex if you have to. I don't and won't mind it one bit at all. Fanfictions arn't all about the smut and sex. I'd rather read one with plot without the smut and all than one with the smut and no plot (the smut's just a bonous that I can live without).

And yes there are rarer crossovers. I think I saw a SGA/Firefly crossover once on fanfiction.net.

Btw, do you have any links to other stories that's SGA/TW/DW crossover? Can be either SGA/TW or SGA/DW or all three.