I bet they say no...
Perch, crappie, and trout all feed primarily on zooplankton, and perch and crappie out-compete trout for zooplankton, So you would automatically reduce the amount of trout that the reservoir could support.
Also, perch and crappie reproduce naturally, so once they are planted you cannot control their populations (think stunted, boom and bust cycles).
And all waters downstream would also end up being stocked with them as well as they drifted downstream during high flows.
Can't hurt to ask though.....