Treating Spell scrolls the star frontiers way

<div>In Star Frontiers a tech character: robotics or computers has skill checks that are +10% per his level and -10% per level of computer or robot or programs when its kind of an opposed situtation</div><div><br /></div><div>so in Fantasy Frontiers a spell scroll situation would be +10% of caster's level vs -10% level of spell? This predicates a profession level for PCs that Star Frontiers doesn't have which I've gone around and around on and feel like I cant escape it- profession as a skill and it allows several actions at the skill level of the profession. <br /></div><div><br /></div><div><br /></div><div><br />The other issue is that each spell as a special skill- <br /></div><div><br /></div><div>Wizard level 3 does not know fireball spell but has a level 2 fire ball spell scroll His skill check to cast: 1/2LOG + 10%/level or 30% -10% per level of spell or -20%= 1/2 LOG +10%<br /></div><div><br /></div><div>However if the same wizard knew fireball to level 1 he could add +10%/level of his spell skill to his chance in the equation above.<br /></div>