[Marty Ward]

Increasing the cost/build time of the reesearch facility could help to. I'm a research nut. If the building took 2 turns to make instead of 1 the pace of research would slow.
Another thought is to have diminishing returns. Have point level where over which additional research point counted at half value, or quarter or whatever.
I don't know about everyone else but I generally research without dividing points. This would encourage dividing points and researching lots of areas at once as the number of points you have increases.