As Castout says, you can switch between RA and LWAMI, as well as Alfa Tau, and even the MilSab RA mod via JSGME. However, as RA is non-compliant, it requires several steps to make it possible to switch between them.
You need to copy your stock DW install (patched to 1.04) to another folder, and run the RA package in that folder. Once done, you copy all the modded files and folders (you can go by date/time) into an "RA" folder, and copy that into the "MODS" folder created by JSGME in the original DW install folder. AT and LWAMI are JSGME-compatible and install there by default. All can then be enabled by JSGME.
So far, that's the most "Ultimate" mod freely available.
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