If you setup a printer in windows, including any extended properties, like the paper tray to use, then this will be picked up.
The only issue is, that printer setup is a local thing, the setup for the name has to be the same for every client PC to work the same way. But I don't even see whether you can embed the tray number in a report with saved printer environment, the usual options VFP saves are papersize, paper orientation (portrait/landscape), copies,... things like that.
You can see what printer options are embedded into your report, if you use the FRX as a table (USE yourreport.frx) and look into the Expr memo field of the first record and see for yourself whether tray is one of the options, or another option that could mean the tray number. If not, you definiately don't gain anything from embedding printer information into the report. Don't assume any option can be embedded by VFP, it's merely a memo field that has some key=value lines, not every printer option is encoded like that. Some are very driver specific and not general purpose.
When you use the printer name option with SET PRINTER TO NAME ("WindowPrinterNameHere") all options are as defined in the Windows Printer settings. That alone means having a specifc Windows printer name/profile is superior to embedding printer info into a report.
Just notice as I described the issue, the setting are not stored into the printer, the settings are stored into the Windows Devices/Printers settings and taken from there when printing by the name dedicated to the profile. This mechanism allows you to set up the same printer even multiple times with different settings under different names.
Besides, that, if you offer the user the printer dialog and he can change settings, that'll override both the embedded settings and the Windows printer settings, so you only have final control, if you disallow users to fiddle with the printer profiles you want to be specific, like printing from a cetrtain tray, only. Besides not offering the Priunter menu you should also not use PROMPT (for promting which printer to use) in the REPORT FORM command. Only all that considered, you can enforce certain settings by predefined names=profiles. With the administration task to set up the printer on all clients in the same manner. I don't know of central printer profiles.
Chriss