Is it in any way possible to write a text on the teleport sign instead of the usual: [TELEPORT] on the first line and coordinates on the others. I think i can recall i once clicked on a teleportsign that didnt say [TELEPORT] following with the coordiantes but a text describing a section of the shop i was in, am i wrong?
To my knowledge you can't do this, but what you can do is place the teleport sign under a block and have a description at head-level above where the block is and it'll teleport the players once they stand on the block (No pressure plate needed)
Supporters can set a certain number of named residence locations and tp direct there or use the name on a tp sign. One could say /home farm or use 1234@farm on a tp sign. Prob what you saw. http://empireminecraft.com/wiki/res-locations/