It really depends on what you are going for.
Max DPS, when you aren't worried about drawing aggro, you want to just mash it pretty much.
The bigger issue comes in that mashing it will likely pull aggro off the tank and cost your group downtime for heals not spent on the tank. Your hide/evade may refresh slower than your backstab, I know this is true if you have a haste item.
Get a feel for how well your tank is able to hold aggro, you may be able to go all out. More often, that is not the case and you will need to time your backstabs so that hide/evade is available to hit right after you backstab (so you can immediately drop aggro if BS pulls it). If you do pull aggro and hide/evade fails, turn auto-attack off. This will help your tank regain aggro and save your healer's mana.
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