It depends on what exactly you want to do - there are several options, but your description is somewhat short and incomplete.
FYI:
The default works that way to have the speed effect the order in which the commands are executed while getting the commands always in the order of the actors - they are not executed "all at once" after the entries, if you're using skills with different speeds and actors with different AGI then you'll see that they are re-sorted into a different order after all commands have been given.
Depending on wether or not you want that speed effect or what you want to replace it with, there are several different options available - one of which was given above.
Other options would include using any of the CTB-Type battlescript, or using Yanflys instant cast (which however adds other effects and sequences) and so on.
If you give us more details on what you want as a result for your battle order, then we can guide you to the variant that can follow that.