Good advice from Kraken, I was just about to suggest many of the same things.
Being on foot for a tamer can be rough, especially if you do spawns and enter Fellucia. Everyone else is gonna be on horse and you'll be a sitting duck.
Some of the things I've thought of:
1) Race change token to Gargoyle so I can fly, naturally. Just can't ride CU any more to "keep it safe" until you need to use it. Another issue is the equipment - hard to get Gargoyle equipment and they can't use many of the arties you normally might. Still the tradeoff might be worth it.
2) Use Ninjitsu trained to 70 and add a bonus from items for llama form (horse speed). Skill points is the issue here - I run a necro mage tamer so it's a very tight fit, I just don't have the points without sacraficing elsewhere right now.
For tamers doing champ spawns on foot, i:
1) Buy Bolas in housing (must be on foot). They are cheap and you can dismount an opponent easily.
2) My PVP Pet attack macro does 3 things: All Stop, All Follow me, All Kill. I learned the hard way you need all 3. First thing, get the pet to stop fighting mobs. Then get pet to follow you out of wherever it is, and then tell pet to kill a target. This has been really effective for me. Even if the GD is slow, at least it forces a target to have to leave the area or they'll get fried.