Don't know, never tried it. I'm not sure if MEdia Center only deletes recordings it creates (in your case since you aren't renaming it could work).
SKip coping and skip remuxing are options which are created for the brave. They have been extensively tested and coded carefully so it should work in most cases but again, there are risks since it isn't compatible with every underlying program. E.g. when
you don't remux and if the source file is WMV, Comskip will not work, ccextractor will not work etc. CCExtractor does not work on WTV files, Comskip DONATOR version works. So really it's an advanced option for folks who KNOW what they're doing and how MCEBuddy
works.
Skip copying is also generally safe (in none of my tests have I had an issue), but it could be some permutation we didn't anticipate or test which could have side effects. Hence the caution.