I would have to look into it again, but as far as I remember, this:
OjitroC wrote:I think the colour settings in that dialog box only change the colour of the counter that appears in the HUD (counting down the life of certain pickups, for example)
is what those settings should do.
Having that said, the X-Pickups is an extremely old mod of mine, developed almost exclusively for the UTR mappack, and developed in conjunction with Creavion (he did/arranged the models and skins, I did the coding and effects).
And while at the end the mappack itself was awesome and the pickups worked relatively well, it's code from nearly 10 years ago, from a time I barely knew how the game worked and my coding skills were garbage-tier compared to nowadays, so the code is quite bad, so don't expect much from it.