My last electrical question was too easy - bike electric tricky one!

[Gingernutz]

Hi all, happy christmas! After years of bodging accessories onto various live wires with gaffer tape and prayers, disconnecting them was interesting. I have a heated vest, grips, autocom, satnav, trickle charger and occasional phone charger. I have decided to add a home made accessory fuse box to the new bike. It will be in its own box and comprise of two busbars- one negative and one positive, and a relay connected to a positive when ignition on wire. The kit will be powered by the battery so there will be no additional load on the loom. I've copied this set up from elsewhere.



This looks ideal but......... I'd like to have some terminals on whether the bike is on or not. (Trickle Charger phone charger). I understand a relay with a fifth pin may be the way forward. What do you geniuses reckon? If I leave the negative bar solid but split the positive leaving these two on their own, is it just a matter of connecting 87a to this end? Or will these are on when  the bike is off - which is probably okay too.

This is the best resource page I could find.
http://www.12voltplanet.co.uk/relay-guide.html