Yeah if only Maul could speak... He would never be able to gather as much support for the separatist cause as Dooku could have... Maul dying was a great thing for Sidious, of course the best part of it was that Qui Gon died, which I think is the reason that Dooku joined the Dark Side. He probably felt the Jedi failed and left the order and then Sidious came along and convinced him that the Jedi sucked donkey dick until eventually Dooku joined the Sith.
Anyways besides the point, Maul would not have been a good thing for Sidious
clones actually can use the force just as well as regular people. And clones can be grown in one year. Actually they can ge grown in less than that, down to tow to three months but they suffer from clone madness. Also, Luuke, Luke's clone, learned to use the force in a matter of weaks when Joruus used some technique on him. THe technique kills the person after a few days though so it is regulary impratical. The reason that Joruus used it was so he could use Luuke to kills the real Luke and save Luke DNA for futher use. Joruus is weaker than Sids so I'm sure Sids could do it. The technique basicaly imparts a doppleganger into another person. Sidious demonstrated this technique several times into clones of his self. Sidous could have made say ten clones of Maul, imparted the doppleganger, then have them regulary teach some of the other clones before they die. Sidious actually did have several students other than Vader, they just weren't apprentices. Kind've like Dooku with Komari Vosa and Asajj Ventress.
Also, Jorus(the orginal) became a Jedi Knight in only four years. Sidious would have more time than that. The problem was that Jorus had a rushed training for some reason and wasn't as good because of it and was naturaly strong in the force which helped to begin with. With an additional four years, It could be done.
Well, Fishy is a hundred per cent right, as usual. Dooku was a leader Sidious wanted. Sidious had no love for Maul; Maul was a pawn. Maul was to kill Qui-Gon, whow as the final straw to tip Dooku into Sidious' pocket. Dooku than leads the army, makes Sidious' other plans come to fruitation. DOoku has outlived his purpose. Bamo, he dies... Welcome to the fold, Annie.
As for cloning Maul, that's ridiculous. Imagine having 1.2 million Force adepts in a time period where there are perhaps a few thousand to ten thousand livign Jedi. You train these clones, hoping that the conditioning doesn't break down and that their obediance doesn't hinder their Force powers, and hoping that the aspect of 1.2 million dark Force adepts don't trigger the rather horrible senses of the lazy, we sit on our hands all day Jedi council and cause a ruckus and a battle against the Sith that would jeopardize your tenative position in trying to become the Emperor we all know and love?
That was a mouthfull of wishful thinking.