Data can not be saved in config or userconfig, because with this protection you can't receive commands amx_destroy or automatically connect to an sv with autoconnet.
But, If you want to edit your config It's very simple, you must to change the attributes "read-only" on off, afther the changes you can chech again the option "read-only" for protection your CS.
How to edit the config?
Click right on the config from Cstrike folder and click Properties and unchech the option "read-only".
About skins, default skins are better for a good fps.
P.s: I like your opinion.