help internal to external memory swap

any way to force change the system to recognise external sd card as internal and vice versa???? i dont want to use lind2sd doesnt work orfoldermount which works but is too demanding when you give this to a child who downloads everything.
the vold file is here
## Vold 2.0 Generic fstab
## - San Mehat (san@android.com)
##

#######################
## Regular device mount
##
## Format: dev_mount <label> <mount_point> <part> <sysfs_path1...>
## label - Label for the volume
## mount_point - Where the volume will be mounted
## part - Partition # (1 based), or 'auto' for first usable partition.
## <sysfs_path> - List of sysfs paths to source devices
######################

## Example of a standard sdcard mount for the emulator / Dream
# Mounts the first usable partition of the specified device

#dev_mount sdcard /mnt/sdcard auto /devices/platform/sdhci-pxav3.0/mmc_host/mmc1

dev_mount external_sdcard /mnt/external_sdcard auto /devices/platform/sdhci-pxav3.0/mmc_host/mmc1
dev_mount internal_sdcard /mnt/sdcard 15 /devices/platform/sdhci-pxav3.2/mmc_host/mmc0

## Example of a dual card setup
# dev_mount left_sdcard /sdcard1 auto /devices/platform/goldfish_mmc.0 /devices/platform/msm_sdcc.2/mmc_host/mmc1
# dev_mount right_sdcard /sdcard2 auto /devices/platform/goldfish_mmc.1 /devices/platform/msm_sdcc.3/mmc_host/mmc1

## Example of specifying a specific partition for mounts
# dev_mount sdcard /sdcard 2 /devices/platform/goldfish_mmc.0 /devices/platform/msm_sdcc.2/mmc_host/mmc1