Additional advanced search functionality

I appreciate this may be a bit niche, but I thought I'd document some functionality I'd quite like in the advanced search.

So, I find it interesting exploring actors across a serial/a set of shows/a franchise and also comparing casts of multiple franchises.

To that end, the following options would be useful:
a) OR option
b) Does NOT have credit

So I could perhaps have something this to see which actors have appeared in EastEnders and somewhere in the televised Doctor Who universe: 
Credit: EastEnders
AND
Credit: Doctor Who OR Torchwood OR Class OR Sarah Jane Adventures OR [any of the other TV spin-offs]

Or if I wanted to find those in the EastEnders cast who hadn't appeared in Doctor Who:
Credit: EastEnders
AND
No credit: Doctor Who OR Torchwood OR Class OR Sarah Jane Adventures OR [any of the other TV spin-offs]

Hope that makes sense and is perhaps worthy of consideration for anyone working on the search product! And apologies if this functionality is already available and I just haven't spotted it yet...