See new thread for 2.0 Changes - Sorcerer / Sage Healing Compendium Updated for 1.2!)

[Kaedis]

Physics, you have to realize that there are two definitions of "force positive". The most common refers to an ability that when cast leaves you at a higher amount of Force than when you started. By this definition, any ability that you can spam for an unlimited period of time without any chance of running out of force counts as force positive. Force Lightning with Sith Efficacy is a good example of this, as you regen 24 Force during the channel and gain 24 Force from Sith Efficacy. Since Force Lightning only costs 26-30 Force (depending on skills and set bonuses), this leaves you higher on Force than you started, and thus its impossible to run out of Force casting nothing but Force Lightning (unless you interrupt FL continually).

The other definition, and the source of the contention here, refers to an ability that leaves you higher on force than you would have been had you not cast the ability at all. The only ability Sorcerers have that qualifies under this definition is Consumption. Talenting into a regen skill that requires you to cast an ability you wouldn't otherwise cast, particularly one that doesn't augment your raid role (example, a dps ability as a healer), is only useful if it fits this definition. It isn't enough for the ability to leave you higher on force than you started, it needs to leave you higher on force than you would be if you hadn't cast the ability (or any other ability) at all in order for it to be worth using in a resource-limited situation. Neither Subversion or Sith Efficacy qualify in this regard, as the maximum regen from both effects is 80% of the base cost of the ability that triggers them.