So if it has mode memory does that mean you have to cycle through UV every time you adjust settings (eg Med to low). That's kinda dumb.
Yes, that's what it means, but I don't see how whether it has mode memory or not could change the fact that there are 4 modes, L-M-H-UV. The modes only advance from 1st mode to 2nd mode, 3rd mode, etc. You can't go directly from medium to low, nor advance the modes in reverse. The sequence is what it is, and most other AAA lights I know only forward advance the modes. I can't imagine any other way it could be, other than always starting in low. I think having mode memory is better in this case (having dual spectrum emitters), rather than always starting in low (no mode memory).
Knowing it has mode memory, you can always set the mode before turning it off to be in the mode you wish it to be when you next activate it, whether immediately or minutes, hours, or days later. The driver remembers the mode you last used when you last switched-off, even across a battery swap, and when you switch it on again, it comes on in that mode. Clicking the light off and on generally does not advance modes (unless madly clicking off and on as fast as possible). The modes only forward advance when the light is on and with a touch or half-press of the switch.
For example, if you are using UV, and you turn the light off, when you turn it back on, it will still be in the UV mode. To leave UV mode, from on, you half-press the switch to get to low, half-press again to medium, half-press again to high, half-press again to UV, etc. What ever mode it is in when you turn the light off, it will be in that mode the next time you turn the light on... this is pretty much by definition what mode memory is.
The only lights I ever used that allowed reverse advancing modes were the BLF (Astrolux) X5 and X6 with toykeeper's firmware interface, where half-pressing the switch quickly advanced forward through the modes, and holding a half-press for a second reverse advanced the modes. Those lights are much larger, have a big button with more travel. LD02 V2.0 is a small light, with a tiny button, and less button travel, so while duplicating that schema in this light is likely possible, it is probably not practical because it would require quite a supple digital dexterity.