You could always define macros to hide the bit manipulation. For example,

#define SETEN (CONF |= 0x01)
#define CLREN (CONF &= ~0x01)

or even:

#define SETBIT(b) (CONF |= 0x01 << b)
#define CLRBIT(b) (CONF &= ~(0x01 << b))

#define SETEN SETBIT(2)

etc.