There were some options given in RoCo1 (4.3, p.47) for this sort of thing. They suggested, among other things, 20-30% extra DPs /level, for secondary skills only. Of course, this came before the RoCoII skill boom, so depending on how much influence you want secondary skills to have this might be enough.
I'm not sure, but I don't think this cropped up anywhere else in the Companions. In our games we used the above rule for a while, then ended up going with 50 + Stat-based DPs (including) using Luck from RoCoIII as a development stat (so 6 DP-generating stats, and we used the 'DPs based on stat bonuses' rule from RoCoVI). It worked well. Everyone seems to have different solutions to this, and you'll find mentions scattered across various threads here.