I'm trying a new mix.....
98% of 1 hour doc shot in 1080 50 I from the FX1
2% shot with the nikon d5100

As the final render would be 1080 50i, should i Desable resample on the 24 P Clips?
thx

If you set the D5100 to output PAL over HDMI, changing this will also change your framerate options, giving you PAL compatible 25p as an option.

Thx , i have already this clips shot in 24 p....
Need to know if i have to import on 50i project what should i do? Leave them like this or should i act on theResample?

You can speed them up in Vegas from 24p to 25p. The increase in speed will be so slight I doubt that anyone would notice anything. If you leave them at 24p and put them on a timeline, I would turn of resample. That way you'll just get one doubled frame every second. You'll see this on pans and zooms, but everywhere else it will be quite subtle.