Dude I am looking at a sony DVR+R media which states 1x-16x speed right in front of me.. I Think sony works..and again my sony dru 820 a supports 1x writing..
i have burned ps2 backup dvds... but i usually do them on a really good quality dvds.. earlier i used to use the samsung pleomax blan dvds(40rs a dvd) and now uptill recent times i used TY dvds.. those do really well. and its not necessary to burn at 1x i did it at 4x, 6x and with out any problems at all
So long as you have a good writer & media, i'm not understanding why it needs to be written at such a slow speed. A lot of discs won't write very well at low speeds. Only way you can tell is if you can quality test (Neros' CD/DVD speed) the written DVD. If you get a score of 90 & above, i daresay it should work just fine.