I would allow PvP in the form of "duel"
It would be a command in teh chat items,etc box and you can issue it to a person, its a one-on-one combat any lvs and items go they can be specified by the challenger on the rules ie no items or ja's,etc.
Another feature of it would be is that you can wager exp or gil a maximum of 300exp and there is no limit to the gil.
A limit on teh exp is because i could have a lv 75 blm and i forfeit to a lv20mnk 7000exp which would make the lvs sky rocket and make a new type of exp seller.
I would limit the duels to 3 a day. No it wouldn't stop expsellers but it does constrict it a lot.
You must also be lv20 or higher to have a duel and it must be quested
I made a lot of applicable suggestions for a new nin2hr on ffxionline, if you read it be sure and read all of it and not just think all of the abilities are in one package...
http://www.ffxionline.com/forums/ninja/54019-new.ninja.2hr.html
For Sams i would give them an ability similar to Auron's entrust in FFX which would allow you to transfer the players desired amount of tp to another char, which would be helpful in getting players ready for a skillchain.
Using the Job ability Entrust manually would give the pt member 50tp by default. Its recast is 2mins
By macro it can be specified how much tp you wish to give to a pt member.
I would give sam an ability to take tp from the mob as well with a 5 minute recast
For rdms I would give them up to tier2 aga spells, tier 4 dia and bio, spells diaga2-4, paralyga, blindaga,slowaga,etc. and reraise.
A lot of jobs can call beasts or pets to help them for bst I would allow them to have 2 pets but the second pet is weaker than the first pet they charm ie i charm a dc pet then w/e the second pet i charm is reduced to an ep lv. Jugs would also follow this. I would also allow bsts to follow a stated part of their job which now isn't used where you could use an ability called Correlation.
Correlation can be use every 5mins, and it would allow the pet to talk to the bst about ToD's (not exact times but stuff like ie i feel <target's> prescense, a good mining spot may be here, there is about to be a change in the weather soon. This would make the bst more applicable for end game hnm tracking and ToD's would be easier to keep up with.