I prefer holiday eng to be like for 2 minutes than 3 one minute counts.
But this whole idea is supportable i mean 4 wouldn't be bad,cause you need some to make things work right,but im kinda neutral about this idea,But in some maps the location of the nades are out of the ordinary,
take an example,Like LS and RC,maybe if there would be some changes in the co-ordination of the nade spawn maybe the gamemode will get more fun and better.
Cheers.