Here's the problem - when you choose whether you want to dl hi or lo-res skins, you also choose which ones will LFS always try to use. So if you have tonns of hi-res skins, but don't have the money on LFSW account atm, you have 2 options - don't download any new skins but make LFS load hi-res if you have 'em, or download every skin again (even though u have it in hires) in lo-res.

I'm proposing to make an option to force LFS use hi-res where available while downloading lo-res (prolly as a forth option to both car and helmet skin download).

LFS will not download a skin if a file with that exact name already exists, that is, if the existing file is also newer than the one on LFSW. Always worked that way for me, with .jpg and .dds

You are saying that if you already downloaded hi-res skin and then you choose to select lo-res in options, the same skin you already have in hi-res will be re-downloaded in lo-res.
If it's true then it's very good suggestion, Fox 2. Didn't know about that.