MP continues to be very unstable - how soon it will crash depends entirely on the size of the universe chosen suggesting a memory leak. Worse yet, autosaves are not recoverable.
Note - Ideology events are much more common in MP since the 2.2 patch - so at least one thing has improved.
With respect to custom races in MP - assuming the unrecoverable crash issue is finally fixed - I'm not sure why Stardock is so focused on custome races that use custom ship designs. I'd just like to be able to play custom races using standard ships which should be doable 'now' (no data passing issues).
As noted, in Multiplayer - Merc Bazaars need to be able to sell resources (at very high prices) in addition to ships as can cause major imbalance if one player is missing access to a key resource early.