That's what I do too. I don't even use a needle for dispensing VG. I just take the needle off, pour the VG into the syringe up to the correct ml mark (with my finger over the syringe opening), then put the plunger in to dispense straight from the syringe into my bottle.
I do use a needle - don't know the gauge, but it is a big ... one, 80mm (>3inches) long. I wish I had that length in a few other gauges.
Eh, but what I wanted to say is that just by chance I discovered that if you ever use Boge cartos you don't need to use your finger as a stopper to be able to use a syringe as an improvised cylinder. The "buttplug" that comes with the cartos is the perfect size to plug it with, and it stays put very well.
I sometimes cut it off a bit, but that's probably more cosmetic than anything, don't think the thin little end sticking up into the syringe matters much in anything bigger than 2ml.
Luer Locking are the best imo, Once before I knew there was a difference, while I was pushing juice into my bottle I had the needle pop off, messy for sure. Also, put some clear packing tape over the numbers on the outside, otherwise they will wear off.
Heh, I've had that happen to me once, but that was sort of special so I've not gone hunting for luer lock yet - luer slip is working good enough for me, I like the convenience and being even a bit careful haven't had much problems.
(That one time: I had a *very* thin needle attached, something like 26G, this needle was also kind of damaged from me using it to micro-drip on an atty and scratching it against the mesh on the bridge, and the liquid I was messing with contained an extraction that had small particulates in it - splosh! And then I cleaned it out in alcohol and got a bit impatient - splosh, splosh! that needle is no longer a part of my set-up... )
I've seen the advice about tape or nailpolish time and time again. I wonder what I am doing wrong, because so far all the markings on my syringes are still there, hardly even faded.
Maybe it is because I never let the syringes stand in a bottle, and always wipe them off and rinse them with alcohol immediately? Or maybe the syringes my local pharmacy sells are just superior?
(I have one from LF too, but have only used it once, will be interesting to see if that one fades faster.)
Blunt tips are probably good, but personally I don't mind the sharps at all and those are easier to find. Sharps will also have a slightly bigger opening than blunts (oval vs round), so with something gooey (VG-heavy) they are definitely a bit easier.
The only thing I don't yet have, but wish for is a long needle (40mm/1½" or more) that would fit through the dropper cap on most of my bottles of flavouring. It is messy having to remove the droppers, and sometimes I'm lazy and do use drops instead of measuring, so I don't want them permanently removed.
A 22G is *just* a little bit too thick, and the thinner ones I bought (26G and 27G) are far too short to be useful for this at all.
I think I will take one of the flavouring bottles with me to my very nice pharmacy* and explain the problem, hopefully they'll be kind and order something in if they don't already have it.
*They are really great - except that they don't really do any compounding and hence don't have things like pure VG or essential oils - always willing to look stuff up, or even phone other pharmacies if they happen to be out of something and you need it quickly. And when it comes to syringes I discovered that they are even pretty cheap: I paid 20 cents (euro) per 1ml syringe, and later I saw someone linking to a 100 pcs box of the exact same model for 19.90 $ on ebay or amazon. Not bad for a small private pharmacy in a notoriously expensive part of an even more notoriously expensive city. 
