Currently without using the command bar there is no way to make a Motor6D between two parts, or a weld for that matter. It is an annoyance to not only insert the motor but also change part0 and part1. Somehow or other this needs to be made easier to do, especially since there are no plugins that do this properly 
If there are no plugins that do this properly, then make your own. The average roblox player doesn’t even know how to use and apply welds, let alone Motor6Ds.
Maybe if there was an intuitive way to insert them in studio the average roblox player might know more about them. Anyways, I’m talking about developers. If you want to make a custom model for animations, there’s no way to insert Motor6D’s without using the command bar to instance it and change its part0 and part1 properties.
In the meantime, there’s CloneTrooper’s Joint Edit.
[quote] In the meantime, there’s CloneTrooper’s Joint Edit. [/quote] I tried that and it’s great, but sadly if you try to put more than one joint in a part it just overwrites it instead of making a new one.
Ozzypig has an all-around welding plugin.
Oh, I wasn’t aware of that.