If one were to merge the mods the way I have done, which requires a bit more work than just putting one on top of the other, then one would enjoy ALL TMaru's improvements you listed in the gameplay part. You will obviously lose the things that RSRDC changes, the most important ones being Tater's campaign layers and Duci's new construction floatillas. I also chose all the RSRDC unit loadouts and properties over those of TMaru, but given enough time one could possibly have the best from both of them. If TMaru is 1 and RSRDC is 1, then in this case 1+1 =~1.9, which isn't too bad in my opinion. ROW and NSM can naturally be used just fine with this installation, since they work with TMaru to begin with. I'm currently trying to merge TMaru 1.6.5 with RSRDC 1.03, and will report back when or if it's done. If enough people are interested and the original modders do not oppose this , I might even release the work or at least write detailed instructions on how to do it. It's not space science, just tedious work
Note that I'm not merging RSRDC to TMaru because I think that Tater's campaign layers suck, which they do not, but because I want to try RSRDC without losing all of TMaru's improvements.