Sawbones is an extremely viable spec for Scoundrels. I have a level 50 Scoundrel who leveled from 10-50 as Sawbones, and have had zero issues both healing and dealing enough damage to easily complete every PvE leveling encounter. If you are still low level, I would recommend you hang in there. Scoundrel is a "late bloomer" for all specs, and you will not really see your DPS or healing skills fully develop until you get in to your 30s. Until that point you are slightly underpowered, but nothing that a little creative damage dealing can do. Learning little tricks like throwing a grenade to knock down a mob then Back Blasting him will help a lot in leveling. I won't post any story spoilers, but you will get better DPS companions later to help offset your healing.
I have played almost exclusively PvP from lvl 40 on. I waited until then to get in to Warzones because as a class we don't have access to many of our vital abilities and talents until later levels, and didn't want to feel gimped running around doing things. After a week at 50 doing dailies and weeklies, I'm about 3/4 geared in purple PvP Centurion/Champion gear, and have no problem healing my PvP teammates and avoiding pesky Imps trying to kill me. If you have any more specific questions about specs, , stats, playstyles, etc, I would be happy to answer them. If you would prefer to develop your own playstyle, go for it! While I do frequent various TOR theorycraft sites to gain some insight, I have in general developed my playstyle and spec on my own, and feel it has been in general very successful.
As far as alacrity, there is a huge debate in the theorycrafting community, but it is generally felt to be an underpowered stat for Sawbones Scoundrels. If you want more info I can provide links and/or discuss it with you.
Enki, 50 Sawbones Smuggler, Republic, Hedarr Soongh