I always thought g94 was a rapid feed? when I use it on my omniturns I dont have any decimals over the max rapid. Matter of fact never tried decimals.
as far as the jerky motion thats usually cause by running small segments and NOT having the highspeed turned on. if its in g94 feed maybe thats too fast? try it in g95 which is usually a feed rate.
Also maybe there is a setting for the jerky motion ( I forget the name) but geof has touched on it a few times, its like semi finish rough finish etc etc.
I use g01 for my feed on my full 4th axis