I have a Kubota 7030 with FEL. The loader works off one set of remotes, so when using it the three point and the other remotes won't work. Is that normal? In other words there is no way to use the loader and a back blade at the same time.
I think you should refine your question as it is not clear what you are asking.
I have a loader and sometime a box blade or back blade on the 3ph. Never been a problem. Actually, since normally I have one hand on the steering wheel, I can only operate either the 3PH implement, OR the loader, with the other free hand.
Now many or perhaps all Kubota tractors use a power beyond hydraulic circuit. This is a loop that passes through all the control valves. When a valve is activated, some or all of the hydraulic flow is diverted.
If all the flow is diverted, anything down stream will receive no flow, so will not operate. If only part of the hydraulic flow is diverted, some continues on and can cause a different hydraulic device to operate, but at a slower rate than it would if it were operated alone and received total hydraulic flow.
Edit: I think, but do not know for sure, that the 3PH is often the first hydraulic control in the power beyond loop. So if you were operating the 3 PH and taking full hydraulic flow from the power beyond loop, then nothing down stream would work until you released the 3PH control lever. Personally, I have never found a need to operate my loader and 3PH at the same time.