Im not sure that is gonna be possible... They only possible way I am thinking you are gonna be able to change it is to use "Meta-morph." Unfortunately I am NO metamorph expert and don't want to give advice on something I am not proficient in..
However.. I am not totally familiar with DS 4.2 ... If it has a toolbox you might be able to tweak it in there... If not you will have to install a different theme over the ROM and I have yet to see one for Darkslide... There is a thread on here dedicated to darkslide under ROMS... That might help out a little... If not.. I think BBcrackerman (I think thats his name) is the dev of that ROM and he is loyal to android forums I beleive.. Maybe you could gather a lil more info from there..
I hope I pointed you in the right direction at least.. dancedroid
I had darkslide and I used metamorph to change the battery (darkslide doesn't have toolbox) and it always ended up going back to the darkslide battery. People said of u found one that was in 10% incriminates then it would work but it never did for me.
Go to the DS thread at MyDroidWorld, page 43 and ask the guy named sfacimma. Post #856. It would be page #86 from phone. BBCrackman has his threads a 20 per page.