This is why especially I like challenge mode of play. It focuses more on team work and having fun...not necessarally for best time, but that can also be fun.
Depending on the stage that I play I change my support tactics. C6,7,8,9 require Shifta constantly and Zalure for some enemies like the Belra. Resta...depends on the team. If the request I resta all the time I will, but if they do not, they can use the mates. The exception for this rule is C9 because of the boss at the end of the stage. There must be plenty of mates available for the Hunters at the end of the stage, so resta many times is ok...but the team should be good enough to not constatly need it. This goes back to strageties on attacking the enemy correctly and with the correct weapon.
If I play normal level up play I will do this order:
Shifta
Deband
Jellen
Zalure
Resta
I will try to resta the team when ever it needs it. Especially bots...they must use mates and it really sucks when the FOnl or HU with resta refuses to use it but for them selves. I can play in teams that I NEVER use a mate the entire game, because I am able to dodge attacks by the enemy and other team mates that have Resta will cast it when required. If hit, I will continue to attack the enemy if safe or un around to a character that has Resta and they will usually see this and cast it, especially a Force character, as their priority should be support, not attacking in a game.
I am really eager to level up my FOnl again...I miss the supportive part of the game. It really does make a difference in a team when you have good support. I can tell you this from playing a HUcl. It is not fun to have a selfish force character that likes to play what I call FOcast...in other words a force character that attacks like a Hunter, but is really more effective with support.
If I play a Force character, or I am a character like a HUnl then I will take on the support role, if my character is the best at it. I played with a friend who was a HUnl in ULTIMATE at level 90 or so....and we had NO problems in ULTIMATE caves playing 2 player. This had to do with his support, for if it was not for the shifta/deband/jellen/zalure/resta the stage would have been a lot harder.
On a side note, depending on the style of play you wish to employ, I believe that if you are hunting with friends for a specific item...and you know your team mates quite will the clearing the rooms as fast as possible is good. On the other hand, if you are playing in a open game with people you do not know, you should be having fun enjoying the game. Not necessarally using the most powerful weapon that you have or trying to 1-combo kill the enemy. Have fun with the stage as there are always team mates that will support with resta ifyou get hit. I have stopped using my Vulcans in open games for this reason...I think they kill too fast and some players really dislike them. Everyone should be able to get at least one hit on every enemy. I try my best not to kill an enemy all my myself. I think it is a little selfish as think the game should be fun for everyone to enjoy, especially in level up play. In challenge mode, rushing into the next room and killing everything as fast as possible is very good, but in level up play...you should wait for the party to enter the room together and kill the enemies together. Not leaving a team mate behind...rushing into the next room. I see this happen so often now that it kinda disgusts me and makes me wonder why I am playing with these people.
Anyway, I think you should just have fun with PSO and follow the golden rule, do unto others as you would have done unto yourself. If you would like a team to show support and good team play, then try your best to be a team player also.
--Sheik

EDIT: I do not disagree with HC's order of support techs...they can be cast in the order needed. Sure, maybe Jellen must be first to be cast in a room, especially if it prevents a player from being 1-hit KOed. It all depends on the situation, and playing a supportive role, it changes on the situations...these are just general guide lines to follow. And on a side note, I try to shifta/deband BEFORE it wears off, this is extreamly important in C6,7,8,9 in challenge mode...it allows for the extra damage and less hits to kill an enemy. This is also very appreciated by players in level up play...as do I appreciate it. I should NEVER have to ask a player to cast shifta/deband/resta. They should be watching the team well enough to answer this question.