busy box, applet not found

Since I managed to create some mips64 binaries and managed to get them on the router's filesystem, I thought I was in a good place....NOT. Apparently busybox (I didn't know this until now), is configured to only run the built in applets. It seems they actually turned off (at compile time) the ability to run arbitrary code via busybox. HOWEVER this certainly doesn't mean I couldn't upload my own firmware...there are at least 3 ways to do this...BUT I don't want to tank my rounter....so on to other ideas....like dsniff