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Actually I don't think you need the user data. Simply drag the position onto the viewport. By right-clicking the HUD enable "Display -> Widget" and then use the right click menu to configure it to your needs. Unfortunately you need to do it for every component of the vector separately. Also the size of the HUD does not auto expand. So you need to touch each slider once for it to expand. This by the way also works in the Attribute Manager itself. You can enable sliders there as well. The user data approach mentioned by @Cerbera on the other hand has the big advantage, that you can nicely constrain the slider (HUD uses the same parameters as set for the user data). Which in case of position and rotation parameters with more or less unlimited value range is most likely what you want and need.

Yes, absolutely. 😉 But in general it works and with other parameters actually quite nicely. And it also works the other way round, as you may want to switch off a slider taking too much space in the HUD.

widget option is for calm nature users 🙂 (since values in small mouse movement fly about thousand units up/down and range is set to not real values (-50k to +50k etc...)) I think best option is invest little time to create UD with nice interface mapped to some "real" values...

You need to make a new user data slider, and link that (usually via a range mapper) to the parameter you want to change, rather than dragging other HUD elements to the VP directly. Here's one I have done today for a client... So first you just create a null, on which to hang your controls, and add the sliders you need to it using the 'add user data' function. Then you can drag the null into xpresso so we can access its user data, and route it wherever we like... CBR