To what extent is LLF forecast of icing conditions a concern in VMC?
Well if you have a forecast of icing, and you go outside and the sky is clear, the forecast is wrong no?

In any case, when you are flying around VFR and there is the possibility of icing on your route, your main concern is the freezing level, and whether you can stay well below it in the event you encounter rain or drizzle or whatever (aside from visibility requirements of course).  If you will find yourself close to or above the freezing level where you plan to cruise, you have to avoid visible moisture, period. 

You're VFR so you will be avoiding cloud anyway, but if there is anything coming down out of the clouds you will pass through, you need to be a couple thousand feet below the freezing level to be safe.

So, if you're going from a to b, at 5000 ft, and the freezing level is 8000 ft, and there is light rain forecast with icing expected, say between 8000 and 15000ft, you're fine at 5000 ft IF, the freezing level is going to stay well above you on your route, but you need to be confident that temperatures aren't going to drop and force you lower part way there.

If the sky is clear or scattered, nice VFR in other words, you are unlikely to see icing in a forecast anyway.