^^ yes, but don't put more than 1" ones...1/2" or better is best. the wider the spacer, the more prone it is to wobbling at high speeds and cracking (not good).
You can put huge spacers in as long as you get appropriately sized studs to go with them.
i'll stick with my original statement.
the wider a spacer is, the more prone it is to wobbling (yes, this can be fixed as you pointed out).
the wideer a spacer is, the more prone it is to cracking. this is not so easy to fix. the celica is a light car so you can put wider spacers than most other vehicles such as SUVs..but i still would not go wider than 1". too risky.