Is the sign for 'occasionally' the same as 'sometimes'?
Yes, in ASL, the concepts of 'occasionally' and 'sometimes' are typically signed the exact same way. The context of your sentence, along with your facial expressions and the speed of the sign, will help clarify the exact nuance and frequency you are trying to convey.
Does it matter how many times I bounce my finger?
Generally, bouncing the index finger one or two times is perfectly sufficient for 'occasionally'. If you bounce it too many times or too rapidly, it might start to look like you are implying 'frequently' or 'often', which completely changes the intended meaning of your sentence.
Can I use my left hand as the bouncing hand?
Absolutely! You should always use your dominant hand to do the active moving—in this case, the bouncing index finger. Your non-dominant hand serves as the stationary flat base. If you are left-handed, simply mirror the sign by bouncing your left index finger on your right palm.