Dandeloin is already being looked at for the next update due to it slowing down tx's to a standstill when testing for current client and maybe some form of plug in Tor feature.Messaging can also be looked at to be reimplemented once it does not affect the overall security or performance of the client.These are not major things.

Regards increasing speed of tx's this can be done on chain using agreed protocol changes or off chain through segwit and lightning network usage.As of yet segwit is not even needed but it is there all the same simply keeping in line with main bitcoin development progress.Get on telegram and discuss any ideas you have with Peter or on reddit with proposals.Like I said we can do anything development wise bitcoin can do due to what has been accomplished over the past year quietly and without any fuss or hype.