Allow it? I encourage it. Best thing I learned as a n00b was to hack the .pgp file.
Here's mine
/, *PLOT
`, *QSAVE
1, *MATCHPROP
2, *PAN
3D, *3DORBIT
A, *ARC
AA, *ATTEDIT
AE, *ALIASEDIT
AL, *ALIGN
AP, *APPLOAD
AR, *ARRAY
B, *BLOCK
BH, *BHATCH
BR, *BREAK
C, *COPY
CC, *CIRCLE
CM, *COPYM
CRAP, *UNDOALL
D, *DIMLINEAR
DA, *DIMALIGNED
DAD, *DIMADJ
DC, *DIMCONTINUE
DD, *DIMANGULAR
DI, *DIST
DO, *DONUT
DQ, *QDIM
DR, *DIMRADIUS
DRE, *DIMREASSOCIATE
DT, *TEXT
DX, *DIMDIAMETER
E, *ERASE
ED, *DDEDIT
EL, *ELLIPSE
EX, *EXTEND
F, *FILLET
FI, *FT2IN
FT, *FLIPTEXT
G, *PLINE
H, *WOODHATCH
HI, *HIDE
I, *INSERT
JDI, *JUSTDOIT
L, *LINE
LFD, *LYRFLTRDEL
LI, *LIST
LT, *LOADTOOLBOX
M, *MOVE
MM, *MIRROR
MT, *MTJUST
N, *DIVIDE
O, *OFFSET
OP, *OPTIONS
OS, *OSNAP
P, *PEDIT
PCD, *POINTCLICKDONE
PJ, *POLYLINEJOIN
POO, *@#%$#&*!##@!
PU, *PURGE
Q, *QLEADER
R, *ROTATE
RE, *REGEN
REV, *REVCLOUD
RR, *RECTANG
RV, *MVSETUP
S, *STRETCH
SC, *SCALE
SP, *SPELL
SS, *SETSCALE
ST, *STYLE
T, *TRIM
TWE, *THATWASEASY
TF, *TEXTFIT
TT, *TXT2MTXT
V, *PREVIEW
VI, *VISIBILITY
W, *WBLOCK
X, *EXPLODE
Z, *ZOOM
Some are duplicates, some obsolete, some launch lisp routines.
Many others that launch lisps but aren't command aliases.
Only 5 users to support so I generally let them alias as they want. That could be troublesome in a larger office, I suppose.