Hi
I think it would be reasonable and authentic to give the Jap knee mortar British 2 inch and German 50cm mortars an indirect fire bombardment delay of 0 as they have no bipod and so go into action virtually instantaneously. (The german mortar has a quick release on the elevation mechanism allowing it to be aimed quickly manually.)
The ideal employment for these weapons is the cover dead ground around a coy point defensive position. As mentioned in the origional post the delay of 3 precludes them doing this effectively in-game.
The Brixia may also qualify for a lessened delay (perhaps 1) owing to the short ranges involved (The elevating dial seems not to have a quick release mechanism.)
I believe the germans ditched the 50 as it was inaccurate and expensive.
From lone sentry for the 50
http://images.google.com.au/imgres?i...%3Den%26sa%3DG
and the brixia
http://images.google.com.au/imgres?i...%3Den%26sa%3DG
Best regards Chuck.