Multiple search is possible but I won't work on it first.
I will work on a distributed client/server version.
The #110 will be likely solved soon.
With the distributed version, I'm almost sure the #115 will also be solved.
110 solve depend on multiple pubkeys search at once, in others , you all will spend time in jumping here and there, mean you need lot of gpu powers, you need lot of ram, etc, and you can not manage all things togather, and no one have these all option available, only my last word, if you design multiple pubkeys search ver, that will be solution for just within 3 days I will work on a distributed client/server version.
The #110 will be likely solved soon.
With the distributed version, I'm almost sure the #115 will also be solved.
Enjoy your research!!!