Hi,
Saying you want more jQuery controls is vague, what specific jQuery UI controls do you need that we don't have? When I have a problem I want to solve and if I find a jQuery plugin that can solve it then I research it and figure out how to implement it. But I don't start out with the goal to build more controls, I set out with a specific goal to solve a specific need or problem. Also I'm very careful about accessibility, javascript widgets can enhance user experience but basic functionality should still work even with javascript disabled.
If you want to build some controls then build them, there is no simple recipe I can tell you to build controls, each control would be built differently to solve a specific goal, some may be simple to build and some may be very complex. Some widgets are built into jQuery UI and others require additional javascript. Many things like tabs and accordion don't even need a control, and can be used directly in content.
Best,
Joe