Adding it to the nominative singular isn't a problem, I think. If the language has a case which is used more often and/or which predicts more cases, we might use that case as the place where all info is dropped. If we wouldn't say the nominative singular isn't attested, we would be lying buy omission.
AFAIK "loge" doesn't exist (as subj. of "logen"), didn't exist (because "logen" wasn't used), and won't exist (because the subjunctive isn't used anymore). We should only add it, once it had 0.01% of the usage of planking when that sense was kept/moved. For me, it's like koningetje, which shouldn't have an incoming link from koning#Dutch either (unless attested, of course). --126.96.36.199 01:48, 10 November 2012 (UTC)