Yes, there is a way, but it's not going to work. Each MC controls 1/4 of the total memory. There won't be enough memory for all cores. Pre-1.4.1 SCC Linux takes up 320 MB for each core. Starting with 1.4.1 SCC Linux needs 640 MB. By default, each MC gets 12 cores.
You are on the right track with sccMerger and the *.mt file. You can direct more than 12 cores to one memory controller. I don't know exactly where you will max out but you won't be able to direct all cores to one MC .., unless you're running your own OS that takes up less memory.