One thing that I would really like to see added to MSP430 family is custom logic module, something similar to XCL (XMEGA Custom Logic) or PSoC's (Cypress) UDBs (Universal Digital Blocks.)
This module would be perfect for things that have to be done in software today, like single wire (WS2811) protocol for example.
If you can think of any other uses, add it below. Maybe we can get TI's attention if the list gets big.