Most of the numerous modding operations added in the 1.134 patch are completely applicable to multiplayer. It also included some collision-detection fixes that are applicable to both single and multiplayer.
Have there been bugs and/or balance changes necessary in multiplayer? Looking at the BugTracker, virtually everything mentioned is in regard to general engine/program stability issues or specifically single player bugs. In that way it isn't particularly surprising that the most recent patch(es) have responded to that.
To be sure, it was back in August that 1.130 was released, the last patch to include free multiplayer DLC in the form of new maps, etc, if that's what you're looking for...but the lack of multiplayer DLC to me doesn't equate to lack of support. But, I too would like to see a patch for the various bugs that linger...and 5 months does seem quite long enough.