61.51 (g) says:
"(g) Logging instrument flight time. (1) A person may log instrument time only for that flight time when the person operates the aircraft solely by reference to instruments under actual or simulated instrument flight conditions."
It's hard to really comment without seeing the columns in the logbook. Given enough columns in the logbook, and not violating the above, I can agree with mitragorz. However, the word "aircraft" in the above reference rules out ground trainer/sim as the intent of the rule. The rule speaks to flying an "aircraft" (not a sim) in the clouds (acutal) or flying an "aircraft" (not a sim) under the hood (simulated).