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I'll answer the 3rd one.
If youve good dark skies, Yes the Telrad is an excellent accessory .
It uses 3 illuminated target rings to aim the scope. The rings are 1/2 degree,2 degrees and 4 degrees so you can starhop and hunt down your quarry using those rings and a starchart to suit. I've used the Telrad for over 10 years and it makes finding things easy as the rings are overlaid on the natural sky. Finder scopes flip the view and make it a bit harder to understand . Once the objects located in the Telrad, using a low power ep in the focuser you can centre the object then increase magnification. Easy.
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