Extension Size Limit

I’m using the CS11 (SAMD21) board by XinaBox with an onboard SD card holder. I can’t use the SD card because of the size limit on an extension. I’ve ported the SDFileSystem library to microbit (pxt-IM01) and I’m only able to create folders due to lack of memory on the microbit. If the size limit on extensions can be increased I can use the SDFileSystem library in maker with CS11. Is it possible for the size limit to be increased to, say, 200Kb? What are the consequences of this?