Wanted to share how I did it.
So far I've only tried my p/s mouse with [hid] and it works.

Followed this howto:
http://sourceforge.net/apps/mediawiki/gizmod/index.php?title=HOWTO_-_Setting_Input_Device_Permissions_-_Creating_a_udev_Rule

The commands "udevrestart" and "udevcontrol" won't work on Lucid, but a reboot is enough after completing these procedures in the terminal (this should work on Ubuntu Jaunty and above)...

# Creating the "input" group:

sudo groupadd -f input


# Adding the user to this group:

sudo gpasswd -a username input


# Creating the file /etc/udev/rules.d/85-pure-data.rules:

gksudo gedit /etc/udev/rules.d/85-pure-data.rules


# Fill that with:

KERNEL=="event*",       NAME="input/%k", MODE:="660", GROUP="input"
KERNEL=="js*",          NAME="input/%k", MODE:="664", GROUP="input"


# Then reboot and check if changes took effect with this command:

ls -al /dev/input


# result should be something like this (notice that event0, event1.. are now in the input group):

total 0
drwxr-xr-x  3 root root     220 2010-06-09 16:22 .
drwxr-xr-x 16 root root    3700 2010-06-09 16:22 ..
drwxr-xr-x  2 root root     100 2010-06-09 16:22 by-path
crw-rw----  1 root input 13, 64 2010-06-09 16:22 event0
crw-rw----  1 root input 13, 65 2010-06-09 16:22 event1
crw-rw----  1 root input 13, 66 2010-06-09 16:22 event2
crw-rw----  1 root input 13, 67 2010-06-09 16:22 event3
crw-rw----  1 root input 13, 68 2010-06-09 16:22 event4
crw-r-----  1 root root  13, 63 2010-06-09 16:22 mice
crw-r-----  1 root root  13, 32 2010-06-09 16:22 mouse0
crw-r-----  1 root root  13, 33 2010-06-09 16:22 mouse1


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Can't say I know exactly what I did, but if this is a good way to do it, maybe a howto could be added to the Pure Data site?