If each sheet is specific to class, you could probably pre-fill the "Class" area on the sheet.
On spellcasters (Wiz, Cleric, etc) you may want a space for "Caster Level"
Thief sheet: automatically add "thieves cant" to the languages section.
Dwarf/Elf/Halfling: you may want to automatically add their racial language.
Elf: you may want to add the elven immunities (e.g. sleep, paralysis).
Halfling/Elf/Dwarf: for infravision, point out the distance (e.g. 30-feet).
Do it, but only if they keep the original sheets too. Without these changes, the sheets are good for a few homemade (sub)classes. If those are filled in, I would need to create new sheets.
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