Greetings,
Researching a single project at a time is a facet of pre-patch Sins that holds great appeal for many - I would very much like to see Sins return to such a state of affairs, or at least allow one to toggle between simultaneous and singular research pursuit.
Simultaneous research paths dramatically shorten that facet of the game. The critical choice of research project is now no longer critical; there is no real hard decision to make anymore. Monies still temper the pace of research, but time does not, and that is not enough.
A single project at a time lends that degree of tension to the game which even lengthened research times cannot match. Without single-path research Sins is less one more strategic decision-making aspect that makes Sins Sins.
I hope such an option might make it into a new patch. Thanks for your time.