I have single button park working on the Polycoms (and single button Day/Night, BlindXfer, and PageAll).
It requires firmware 3.1.1, and like most issues with the Polycoms it was a complex endeavor to figure it all out, but once I got it working it's pretty easy.
If anyone would like a copy let me know and I'll post what I've got.
<efk>
<version efk.version="2" />
<efklist
efk.efklist.1.mname="callpark"
efk.efklist.1.status="1"
efk.efklist.1.label="Call Park"
efk.efklist.1.use.active="1"
efk.efklist.1.action.string="#70"
efk.efklist.2.mname="blindxfer"
efk.efklist.2.status="1"
efk.efklist.2.label="Blind XFer"
efk.efklist.2.use.active="1"
efk.efklist.2.action.string="$P1N10$$Trefer$"
efk.efklist.3.mname="daynight"
efk.efklist.3.status="1"
efk.efklist.3.label="Day Night 1"
efk.efklist.3.use.active="1"
efk.efklist.3.action.string="*281"
efk.efklist.4.mname="pageall"
efk.efklist.4.status="1"
efk.efklist.4.label="PageAll"
efk.efklist.4.use.active="1"
efk.efklist.4.action.string="800"
/>
<efkprompt
efk.efkprompt.1.status="1"
efk.efkprompt.1.label="Extension: "
efk.efkprompt.1.userfeedback="visible"
efk.efkprompt.1.type="numeric"
efk.efkprompt.2.status="1"
efk.efkprompt.2.label="PIN Code: "
efk.efkprompt.2.userfeedback="masked"
efk.efkprompt.2.type="numeric"
efk.efkprompt.3.status="1"
efk.efkprompt.3.label="Password: "
efk.efkprompt.3.userfeedback="masked"
efk.efkprompt.3.type="numeric"
efk.efkprompt.4.status="1"
efk.efkprompt.4.label="Conf ID: "
efk.efkprompt.4.userfeedback="visible"
efk.efkprompt.4.type="numeric"
efk.efkprompt.5.status="1"
efk.efkprompt.5.label="Extension: "
efk.efkprompt.5.userfeedback="visible"
efk.efkprompt.5.type="numeric"
/>
</efk>
<softkey
softkey.feature.newcall="1"
softkey.feature.endcall="1"
softkey.feature.split="1"
softkey.feature.endcall="1"
softkey.feature.split="1"
softkey.feature.join="1"
softkey.feature.forward="1"
softkey.feature.directories="0"
softkey.feature.callers="1"
softkey.feature.mystatus="1"
softkey.feature.buddies="1"
softkey.feature.basicCallManagement.redundant="0"
softkey.1.label="Park"
softkey.1.action="!callpark"
softkey.1.enable="1"
softkey.1.precede="1"
softkey.1.use.active="1"
softkey.2.label="Blind X"
softkey.2.action="!blindxfer"
softkey.2.enable="1"
softkey.2.precede="1"
softkey.2.use.active="1"
softkey.3.label="DayMode."
softkey.3.action="!daynight"
softkey.3.enable="0"
softkey.3.precede="1"
softkey.3.use.idle="1"
softkey.4.label="PageAll"
softkey.4.action="!pageall"
softkey.4.enable="1"
softkey.4.precede="1"
softkey.4.use.idle="1"
softkey.4.use.dialtone="1"
/>
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