When I first read this request, admittedly my immediate reaction was "arrgh, interface hell!" ... buttons floating around left- right- and center, website looking like an airline-cockpit, it's just not good practice, and is confusing for the visitor. I do understand your request though, but this is something we will have to contemplate for the future ... for now, no. It is our responsibility to enable interfaces in X3 that work well, and it's already crowded.
- custom links
- switch to another language
- link to contact page
- shopping cart....
It is really important in modern design to try to keep things as simple as possible, and consolidate items into the menu or the footer. Else you will be confusing the visitor, they just don't have the patience to understand why there are menu's floating left, top and right. Just for example "language", this button is used MAX once per visitor (most likely not used at all) ... so why have fixed language items visible all the time? Custom links and contact page in another toolbar? It's just not friendly. Shopping-cart? Yes, but this would be a dedicated solution anyway, and yes we would likely have to settle for special buttons on the right for this ...