[Gpa113]

That's exactly what I've just done on my new 50 foot 4 lane layout, and as Kevan says, it is so much easier.

I used decent quality wire, attached small spade terminals onto each end ( which were crimped nice and tight), then placed a small bit of duct tape to keep them firmly in their place!  

I went from the adjoining straight to where the power feed comes in, directly across to the mid point of the layout.  It has made such a difference to the power issues I originally encountered. 

The most important thing with Scalextric Sport Track is to make sure all the tabs are really tight, even new track requires checking.   I had missed one on the Green lane,  and the rails were not in permanent contact.  Remove the straight,  tighten the tabs, problem solved.  I also had one radius 4 bend which dropped power.  It didn't matter what I tried it wouldn't improve.  As it was a used piece of track I simply swopped it out for a new piece.  Problem solved! 

Once in a while I run a cloth with a bit of GT85 on it around all the lanes, makes a huge difference. 
Also from reading other posts on the forum about similar issues,  I have been converted to the magic powers of Innox, courtesy of Woodcote.  This stuff is impressive,  it improves the conductivity big time, but you only need a little (tiny!) amount,  otherwise its a bit like rallycross