We did the same thing, photocopied all the relavent charts. In fact, in the RM2 + RMCII hayday, our character sheets were 4 pages long (the front summary, back page, and 2 pages of skills). We photocopied that onto a large sheet of paper folded in half (about 16x11, so when folded in half was an 8x11) and this booklet then held the extra charts (i.e. spelllaw copies, armslaw tables, crits as well). This way, each player had their own little booklet to play with. Seems like a lot, but really saved time once combat started.
-shnar